Frankincense resin, the material the oils are distilled from.

Essential Oils & Aromatherapy · Essential oil

Frankincense Species Compared (Carterii, Sacra, Frereana, Serrata)

Q: Is frankincense oil safe to swallow?

No. We do not advise swallowing any essential oil. Poison Control warns that some essential oils are poisonous if swallowed and that breathing oil into the lungs can cause pneumonia. We found no data on swallowed frankincense oil of any species, so no safe amount is known. If someone swallows any essential oil, call poison control (US: 1-800-222-1222) or your emergency number.

Q: Are carterii and sacra frankincense different?

Not as plants. In the GBIF database, Boswellia carteri (also spelled carterii) is a synonym of Boswellia sacra. In a 2005 resin study, the two were quite alike. Oils may still differ by where the resin was grown and how it was distilled.

Q: How does Boswellia frereana differ from the others?

In resin tests it lacked the incensole family of compounds and held many alpha-phellandrene dimers. Lab studies of B. frereana used resin extracts, not essential oil. We found no study of its essential oil in people.

Q: Which frankincense species is best?

No source we read shows that. The human trials do not name their species, and lab comparisons mostly use resin extracts. In one nine-species lab comparison B. sacra extracts were most toxic to breast cancer cells in a dish, which is not a health benefit.

Q: Can frankincense oil cause an allergic reaction?

Yes. A case of allergic contact dermatitis from Boswellia carterii oil has been reported, and another from a Boswellia serrata extract in a cream, though we could read only the titles. Poison Control says to dilute oils in a carrier oil, avoid damaged skin, and stop and wash off if a rash appears.

Q: Is a bottle of carterii frankincense oil really carterii?

Not always. In one analysis of 21 commercial oils sold as B. carteri, several held synthetic additives, castor oil, or another Boswellia species. A different paper found B. occulta oil in bottles sold as pure carteri, including certified organic oil.

Q: Can a lab test tell the species apart?

Yes, but with care. A 2016 study told four species apart from their scent compounds, and a 2005 study did so for resins of certified origin. A 2026 review says single markers are not enough, and combined methods work better.

Q: Does frankincense oil treat cancer?

No. B. sacra and B. serrata oils killed cancer cells in dishes, and B. sacra oil slowed a tumour in mice. No trial in people was found. Cancer should be treated by a medical team.

Q: Does frankincense oil help with tiredness or back pain?

Evidence is weak. A trial of frankincense oil alone found no effect on tiredness during chemotherapy. Massage with a frankincense and myrrh mix lowered back pain scores in one trial and not in another, and myrrh was always in the mix. No species was named.

Q: Is it safe in pregnancy, for babies, children or pets?

We found no data for any of these oils in pregnancy, breastfeeding, babies, children or pets. Poison Control notes that children have thin skin and immature livers and may be more susceptible. Ask a doctor, midwife, pharmacist or vet, and keep bottles out of reach.

Boswellia sacra (also written B. carterii), Boswellia frereana, Boswellia serrata · also called Frankincense, olibanum, Indian frankincense (B. serrata)

Frankincense oil is sold under four names: carterii, sacra, frereana and serrata. Carterii is an older name for sacra, so there are really three species. Their resins differ in smell and chemistry, but no human trial we found names the species it used. So no species has been shown to work better than another. Never swallow the oil, and the bottle may not hold the species on the label.

General information, not medical advice. Last substantive update October 25, 2026 · Not medically reviewed. A named clinician has not signed off on this page. How this page is made

About Frankincense Species Compared (Carterii, Sacra, Frereana, Serrata)

Frankincense oil from carterii, sacra, frereana and serrata trees is not one thing. The resins have different chemical fingerprints, and the labels are often wrong. But the human trials do not name their species, so nobody can say which one works. Safety comes first: do not swallow it, expect possible skin allergy, and be wary of mixed or mislabelled bottles.

Four names, three species

The names on bottles are carterii (also spelled carteri), sacra, frereana and serrata. In the GBIF plant database, Boswellia carteri is a synonym of Boswellia sacra, so carterii and sacra are the same species under two names. Boswellia frereana and Boswellia serrata are separate accepted species. All belong to the family Burseraceae.

Where they come from, as the papers say: B. sacra resin from Oman, and also from Somalia and Somaliland; B. frereana is described as traditional Somalian frankincense; B. serrata is produced only in India. We did not check range maps.

A fifth commercial species, Boswellia papyrifera, is also sold and is mentioned below because it turns up in conservation work. The single oil page covers the oil in general, the human trials and the difference from boswellic acid capsules.

^{32 12 5 22}

How the chemistry differs

A 2016 study analysed 46 resins and oils sold as B. sacra, B. serrata, B. papyrifera and B. frereana and found 216 compounds. Statistics could tell the four species apart by their scent compounds, and the sold name usually matched the chemistry.

A 2005 study of six resins with certified origin gave the main differences. B. carteri and B. sacra were quite alike, with isoincensole acetate as the main marker. B. serrata also had it, but set itself apart with methylchavicol, methyleugenol and one unidentified compound. B. frereana lacked the incensole family altogether and held many alpha-phellandrene dimers.

Oil analyses use different methods, so they do not line up side by side. One hydrodistilled B. serrata oil was led by octyl acetate (41%) and nerolidol (14%). A different steam-distilled oil, with the species not named, was mostly diterpenes (42.5%), led by a duva-type acetate and octyl acetate. Octyl acetate has been called a B. papyrifera marker, appears in B. serrata oil, and is also added as a cheat, so one compound cannot name a species. A 2026 review says the same: single markers are not enough.

^{18 10 8 14 20 15}

Which species has been studied for what

In people: three small trials of oil massage or foot rubs and one blend trial. None of the abstracts names the species used. So the human results cannot be handed to any one species. For the results themselves, see the Benefits tab.

B. sacra: oil from Omani resin, made by long, hot distillation, killed cancer cells in dishes and slowed a mouse tumour. In a nine-species comparison of resin extracts, B. sacra was the most potent against breast cancer cells in a dish, and toxicity rose with the content of triterpenic acids.

B. serrata: oil was toxic to liver cancer cells in a dish and showed antioxidant activity in test tubes. Most of the capsule research on Indian frankincense is about resin extracts and boswellic acids, which are a different product. See the Boswellia profile.

B. frereana: the lab studies we found used resin extracts, not essential oil, on cartilage and breast cancer cells. We found no study of B. frereana essential oil in animals or people.

B. carterii: the clearest facts are about its labels and its adulteration, not its effects.

^{23 26 17 24 2 8 4 22}

Naming confusion and adulteration

In one analysis of 21 commercial oils sold as Boswellia carteri, 6 held synthetic limonene, 3 synthetic octyl acetate and 3 castor oil. Others held Boswellia occulta, B. serrata or resin, and one held phthalates. This is one lab's collection, not a market rate.

Another paper traced a marker called methoxydecane to Boswellia occulta, a newly described species. Oil of B. occulta turned up in bottles sold as pure B. carteri, including certified organic oil. The authors say organic certification does not secure purity in wild-gathered plants.

Poison Control says it is hard to know the species, strength or contaminants in an essential oil bottle. We recommend no product.

^{20 12 27}

Where the oil comes from: the trees are under pressure

All frankincense is harvested from wild trees, and a 2025 study describes serious social and environmental problems and declines in several species. A trade review says demand for Indian frankincense (B. serrata) far exceeds what can be harvested without endangering the species, and starts to affect African frankincense.

Other species show what over-tapping can do. In northern Ethiopia, tapping Boswellia papyrifera without rest years made trees more prone to beetle damage. B. ogadensis was listed Critically Endangered in 2018, though a 2022 survey found it more abundant than thought.

In Oman, oil from cultivated Boswellia sacra trees was chemically similar to wild oil, which hints at plantations as an option, with mixed social and conservation effects. We did not read a species-by-species conservation status for B. sacra, B. carterii or B. frereana, so we say nothing about their exact standing.

^{7 5 16 13}

Claims and rules

The FDA says claims that a product eases pain, treats depression or anxiety or helps sleep are drug claims, and that natural does not mean safe. NCCIH says we do not know whether aromatherapy helps insomnia because little rigorous research has been done. This page makes no treatment claims and recommends no product.

^{29 28}

At a glance

Traditional uses history, not proof

Resin used as incense and in perfumes, and in traditional medicine (lab papers read).
Boswellia frereana called traditional Somalian frankincense (a 2018 lab paper).
The distilled oil traditionally used for aromatic therapy (a 2011 lab paper).

Studied for research

Tiredness, oil alone on the feet, mixed (no effect in chemotherapy; species not named)
Back pain and comfort, massage with frankincense and myrrh, low (species not named)
Cancer cells in dishes and mice, B. sacra and B. serrata oils, lab only, insufficient
Cartilage and airway-cell inflammation, resin extracts including B. frereana, lab only, insufficient
Antioxidant and enzyme tests, B. serrata oil, test tube only, insufficient

Main compounds

Alpha-pinene and octyl acetate: found in oils from different named species, so neither identifies one species
Isoincensole acetate: the main diterpene marker in B. carterii and B. sacra resin; also in B. serrata
Alpha-phellandrene dimers: a fingerprint of B. frereana resin, which lacks the incensole family

Common forms

Essential oil (distilled from the resin)
Oil diluted in a carrier oil for massage (as used in the trials)
Blends of several species or oils (some labelled only 'frankincense')
Resin extract and boswellic acid capsules (different products; not essential oil)
Resin or incense (different product)

Research links: Poison Control: Essential oils · NCCIH: Aromatherapy · NIEHS: Essential oils · FDA: Aromatherapy · PubMed: Frankincense species volatiles compared (2016) · Research Library · Genes & Biomarkers Library

What it is and its history

Accepted scientific name: Boswellia sacra (includes B. carteri/carterii); B. frereana; B. serrata (three accepted names, four trade names)
Naming authority: B. sacra Flueck.; B. frereana Birdw.; B. serrata Roxb. ex Colebr.
Synonyms: Boswellia carteri Birdw. is a synonym of B. sacra (also spelled carterii)
Common names: Frankincense (English); Olibanum (English); Indian frankincense (B. serrata) (English); Somalian frankincense (B. frereana, per a 2018 paper) (English)
Family or group: Burseraceae, per GBIF.
Classification: Plantae > Burseraceae > Boswellia > four trade names: B. carterii (= B. sacra), B. sacra, B. frereana, B. serrata
Native range: From the papers only: B. sacra resin from Oman ('Omani' resin) and, per Johnson 2019, B. sacra (syn. B. carteri) also from Somalia and Somaliland; B. frereana as 'traditional Somalian frankincense'; B. serrata from India only (Brendler 2018). Range maps were not checked.
Habitat: Not checked.
What it looks like: Part used: Oleo-gum resin tapped from the trunk; the essential oil is distilled from the resin.; Roots: Not checked.; Stems: Resin is tapped by wounding the trunk (tapping studies).; Leaves: Not checked.; Flowers: Not checked.; Fruit: Not checked.
Cultivation: A 2025 study compared oil from cultivated and wild Boswellia sacra trees in southern Oman and found them similar; all frankincense is described as currently harvested from wild trees.
Harvest and processing: Resin is distilled with water or steam. In lab work with B. sacra, longer and hotter hydrodistillation (100 degrees C for 12 hours) brought more large molecules, including boswellic acids, into the oil.
Look-alikes and adulterants: Name: Boswellia occulta; Note: A newly described species whose oil, carrying the compound methoxydecane, was found in oils sold as pure B. carteri, including certified organic oil (Johnson 2019).; Name: Boswellia papyrifera; Note: A fifth commercial species, marked in resin by incensole and its derivatives, n-octanol and n-octyl acetate (Hamm 2005).; Name: Myrrh (Commiphora); Note: A different resin often sold and studied with frankincense.; Name: Boswellic acid extracts and capsules; Note: Resin extracts, not essential oil. Most arthritis and bowel trials use these. See the Boswellia profile.
Sustainability and conservation: Several frankincense trees are under pressure. A trade review says Indian frankincense (B. serrata) is under imminent decline from demand and harvest practice, which starts to affect African frankincense. Over-tapping of B. papyrifera made trees more prone to beetle damage in Ethiopia. B. ogadensis was listed Critically Endangered in 2018, though a 2022 survey found it more abundant than thought. A 2025 paper reports serious problems and declines in multiple frankincense species. Species-level status for B. sacra, B. carterii and B. frereana was not read.

Traditional use and history history, not clinical proof

Tradition or era	Documented use	Source
Traditional medicine, perfume and incense	The opening of the lab papers read describes frankincense resins as used in traditional medicine, incense and perfumes; B. frereana is called traditional Somalian frankincense. No historical source was read for dates.	Suhail 2011; Parr 2018; Stengler 2026
Archaeology	Hamm 2005 used the chemical fingerprints to assign a botanical origin to one archaeological frankincense sample.	Hamm 2005
Aromatherapy	The oil prepared from the resin is described as traditionally used for aromatic therapy (Suhail 2011).	Suhail 2011

Traditional use shows how it was used. It does not show that it works or is safe today.

What is inside, and how it may work

What it contains and how those compounds act in cells and animals. Laboratory and animal mechanisms are not proven effects in people.

Main compounds

Compound	Family	Where it is concentrated	Activity studied	Level of evidence
Alpha-pinene PubChem 6654	monoterpene	Oil The main compound of a commercial four-species oil; part of a delta-3-carene/alpha-pinene type in wild B. sacra trees; 3.1% in one frankincense oil (species not named).	A common scent compound. No effect in people is shown here. ^{19 7 14 31}	Laboratory
Octyl acetate PubChem 8164	ester	Oil 41.09% of a hydrodistilled B. serrata oil (2026); 13.4% in a steam-distilled frankincense oil (species not named); named as a marker of B. papyrifera resin (2005); synthetic octyl acetate found as an adulterant in 3 of 21 commercial 'carteri' oils.	A scent compound. Because it appears in oils from different named species and as an adulterant, it cannot identify a species alone. ^{8 14 10 20 31}	Laboratory
Isoincensole acetate	diterpene	Resin Main diterpene marker in B. carteri and B. sacra resin; also present in B. serrata (Hamm 2005).	A marker compound; no effect shown. No PubChem entry was checked for this exact name. ¹⁰	Laboratory
Incensole and incensole acetate PubChem 53386731	diterpene	Resin, oil Marker of B. papyrifera resin; absent from B. frereana (Hamm 2005); incensole was 28.56% of a hexane extract of B. serrata gum, not of the oil (2026).	Marker compounds; no effect shown here. ^{10 8 31}	Laboratory
Alpha-phellandrene dimers PubChem 7460	monoterpene dimers	Resin A high amount in B. frereana resin (Hamm 2005). The CID is for the single molecule, not the dimers.	A fingerprint of B. frereana; no effect shown. ^{10 31}	Laboratory
Methylchavicol (estragole) and methyleugenol PubChem 8815	phenylpropenes	Resin Help set B. serrata resin apart from B. carteri and B. sacra (Hamm 2005).	Marker compounds in this paper. We read no safety statement about them in frankincense. ^{10 31}	Laboratory
Nerolidol PubChem 5284507	sesquiterpene alcohol	Oil 13.64% of a hydrodistilled B. serrata oil (2026).	A scent compound; no effect shown here. ^{8 31}	Laboratory
Epi-lupeol	triterpene	Resin extract Principal constituent of a B. frereana extract (Blain 2010). No PubChem check was done.	Principal constituent of the extract that lowered inflammatory markers in cartilage in a dish. ⁴	Laboratory research

Mechanisms, receptors and pathways

Target or pathway	Gene or receptor	What was found	Level
Caspase-dependent apoptosis and cell-cycle proteins	caspases, cyclin D1, cdk4, Akt, Erk1/2	B. sacra oil triggered cell death in pancreatic and breast cancer cells in culture and slowed a mouse tumour. The responsible chemicals were not identified. ^{17 26}	In vitro and animal
Caspase-3 apoptosis and 5-lipoxygenase (predicted)	caspase-3; 5LO by computer docking	B. serrata oil and AKBA were toxic to liver cancer cells; the computer model predicted some oil compounds could block 5-lipoxygenase. ²	In vitro and in silico
c-Met receptor signalling	c-Met (HGF receptor)	A B. frereana extract blocked c-Met activation and slowed breast cancer cell movement in a dish. ²²	Laboratory research
Cartilage matrix-breaking enzymes and inflammation messengers	MMP9, MMP13, COX-2, PGE2	A B. frereana extract lowered these markers in cartilage explants. ⁴	Laboratory research
Drug-metabolising liver enzymes	CYP1A2, 2C8, 2C9, 2C19, 2D6, 3A4	Gum-resin extracts of all four species blocked these enzymes in test tubes. ⁹	Laboratory research
Lymphocyte proliferation	Not stated	One steam-distilled frankincense oil (species not named) showed strong immunostimulant activity in a lymphocyte test. ¹⁴	Laboratory research

Absorption, metabolism and elimination

Absorption: Not established. No study of skin or lung absorption of any of the four oils was found.
Distribution: Not established.
Metabolism: Not established for the oils.
Elimination: Not established.
Bioavailability: Not established.

Isolated compounds versus whole extracts

Steam- or hydro-distilled essential oil, resin soaked in oil, resin extracts and boswellic acid capsules are different products. The species comparisons in the lab mostly use resin or resin extracts, not shop oil, so they show what differs in the plant, not what is in your bottle. In B. sacra lab work, boswellic acids entered the oil only after long, hot distillation.

Nutritional composition

Frankincense oil is not a nutrient and has no nutritional claim. This page does not describe eating or swallowing the oil.

5benefits and uses looked at

32studies and sources checked

Low certaintybest evidence rating found

4lab markers tracked in trials

1 mixed findings1 low certainty3 not enough evidence

What is Frankincense Species Compared (Carterii, Sacra, Frereana, Serrata) good for?

The uses people ask about, and how strong the evidence is for each. No study below shows that one species is better than another. Read the certainty label first.

Tiredness and fatigueMixed findingsOne trial of frankincense oil alone on the feet found no effect on tiredness in people having chemotherapy. A four-oil blend that includes frankincense lowered fatigue scores in women after COVID-19, but it is a company product and frankincense was not tested alone. Neither abstract names the species. Back pain and comfort (massage with frankincense and myrrh)Low certaintyTwo Turkish trials used a frankincense and myrrh oil mix for massage. In chronic low back pain it beat jojoba-oil massage and no massage. Before a heart procedure it did not lower pain, but comfort scores were higher. Myrrh was always in the mix and the species is not named. Cancer cells in dishes and mice (lab only)Not enough evidenceDistilled B. sacra oil killed breast and pancreatic cancer cells in dishes and slowed a pancreatic tumour in mice. B. serrata oil was toxic to liver cancer cells in a dish. A B. frereana extract (not oil) slowed breast cancer cell movement. This is not evidence that any oil treats cancer. Inflammation signals in cartilage and airway cells (lab only, extracts)Not enough evidenceA B. frereana resin extract lowered inflammation markers in cartilage tissue in a dish. In airway cells, B. serrata extract was strongest at damping inflammatory messengers in one model. These were extracts, not essential oil, and no person was treated. Antioxidant and enzyme tests in test tubesNot enough evidenceA distilled B. serrata oil scored higher than a hexane extract in several antioxidant tests and blocked more of three enzymes in test tubes. A commercial oil mixing four species also had antioxidant activity. These are chemistry tests, not effects in the body.

Benefits, one by one

Each card is a research question, not a promise. Tap a goal to filter. Open a card to see the studies, doses and limits.

Tiredness and fatigue

Mixed findings

One trial of frankincense oil on the feet found no effect on tiredness in people having chemotherapy. A trial of a four-oil blend that includes frankincense found less tiredness in women after COVID-19. Neither trial names the species, and the blend is a company product.

2 studiesOil on the feet in one trial; inhaled blend in the other. Amounts are…

Studies, doses and limits

What the trials found

Two randomised trials: 70 people having chemotherapy (frankincense oil versus carrier oil on the soles of the feet) and 40 women with fatigue after COVID-19 (inhaled four-oil blend versus placebo).

Results

Chemotherapy trial: no significant change in fatigue over time or between groups. Post-COVID trial: lower fatigue scores with the blend (p = .020).

Effect sizes as reported

Chemotherapy trial: no effect. Post-COVID trial: a large effect size on a self-rated score (partial eta squared 0.198).

Why this rating

One null pilot trial of frankincense alone against one small positive trial of a company blend; both used self-rated scores and neither names the species.

Form and dose studied

Oil on the feet in one trial; inhaled blend in the other. Amounts are not given here.

Who was studied

Adults having chemotherapy; women more than 5 months after COVID-19.

Limits

The positive trial tested a blend made by a company that sells essential oils. The species is not named in either abstract, so no species can be credited or blamed.

Why researchers looked

Tiredness is common in cancer care and after infections, and people ask whether scent or skin oils can help.

Traditional use

Not described in the papers read.

Proposed mechanism Preliminary mechanism

Not established. The trials do not test how any species might work.

A proposed mechanism does not show that the effect happens in people.

Do not swallow essential oil and do not put it on the skin undiluted. See the Safety tab.

^{23 11}

Back pain and comfort (massage with frankincense and myrrh)

Low certainty

Two Turkish trials used massage with a frankincense and myrrh oil mix. In chronic low back pain it beat jojoba-oil massage and no massage. Before a heart procedure it did not lower pain, but people rated their comfort higher. Myrrh was always in the mix and the frankincense species is not named.

2 studiesDiluted oil massage; strength not given in the abstracts.

Studies, doses and limits

What the trials found

Two randomised trials: 91 adults with chronic low back pain and 90 people before a cardiac electrophysiological procedure.

Results

Low back pain: pain and disability scores fell more with the oil massage than with jojoba massage or no massage (p < 0.001 on three scales). Before a heart procedure: no difference in pain; comfort scores were higher.

Effect sizes as reported

Not given in the abstracts.

Why this rating

Two small trials from one research group, one positive and one mixed, with myrrh in every mix and no species named. Massage itself may help, and the jojoba control only partly separates that.

Form and dose studied

Diluted oil massage; strength not given in the abstracts.

Who was studied

Adults with chronic low back pain; adults before a heart procedure.

Limits

Cannot separate frankincense from myrrh, or the species from the massage. Self-rated scores.

Why researchers looked

Massage with scented oils is a common comfort measure in nursing care.

Traditional use

Not described in the papers read.

Proposed mechanism Preliminary mechanism

Not established.

A proposed mechanism does not show that the effect happens in people.

Do not swallow essential oil and do not put it on the skin undiluted. See the Safety tab.

^{3 21}

Cancer cells in dishes and mice (lab only)

Not enough evidence

Distilled B. sacra oil killed breast and pancreatic cancer cells in dishes and slowed a pancreatic tumour in mice. Distilled B. serrata oil was toxic to liver cancer cells in a dish. A B. frereana extract (not oil) slowed breast cancer cell movement in a dish. B. sacra resin extracts were the most potent of nine species in one breast-cell comparison. None of this is a treatment.

5 studiesLab oils and extracts. No human amounts.

Studies, doses and limits

What the trials found

None found. No trial of any frankincense oil in people with cancer was found.

Results

B. sacra oil (Omani resin, long hot distillation): three breast cancer cell lines lost viability more than a normal breast line; pancreatic cancer cells died and a mouse tumour slowed. B. serrata oil: toxic to Huh-7 liver cancer cells, less potent than the boswellic acid AKBA. B. frereana resin extract: less cancer-cell movement and invasion. Nine-species resin extract comparison: B. sacra most potent on MDA-MB-231 cells.

Effect sizes as reported

Not applicable to a dish; one number: B. sacra resin extract average IC50 8.3 micrograms per millilitre (a dose that halves cell numbers in a dish, not a human amount).

Why this rating

Lab and animal work only. Different species, preparations and cell types. Long, hot distillation makes oil unlike shop oil.

Form and dose studied

Lab oils and extracts. No human amounts.

Who was studied

Cell lines and mice.

Limits

Dishes and mice do not show what happens in people. Cancer should be treated by a medical team. The resin-extract and frereana results are not oil.

Why researchers looked

Boswellic acids from resin have been studied as cancer-cell toxins, and researchers tested whether the oil acts the same way.

Traditional use

Not described in the papers read.

Proposed mechanism Preliminary mechanism

In the lab, the B. sacra oil triggered caspase-dependent cell death and changed cell-cycle proteins; the compounds responsible were not identified. The B. frereana extract reduced c-Met receptor signalling. The B. serrata oil work linked toxicity to caspase-3.

A proposed mechanism does not show that the effect happens in people.

Do not swallow essential oil and do not put it on the skin undiluted. See the Safety tab.

^{26 17 2 22 24}

Inflammation signals in cartilage and airway cells (lab only, extracts)

Not enough evidence

A B. frereana resin extract lowered inflammation signals and collagen breakdown in cartilage tissue in a dish. In human airway cells, extracts from several species were compared and B. serrata was strongest at damping inflammatory messengers in one model. These are extracts, not essential oil.

2 studiesLab extracts. No human amounts.

Studies, doses and limits

What the trials found

None found for these extracts, and none for any species' essential oil.

Results

Cartilage explants (B. frereana extract): less collagen breakdown and lower inflammatory markers. Human airway cells (extracts of several species): B. serrata had the strongest inhibition of inflammatory cytokines in the virus-mimic model.

Effect sizes as reported

Not given in the abstracts as comparable numbers.

Why this rating

Resin extracts on tissue or cells in a dish; no animal or human data in the papers read.

Form and dose studied

Lab extracts. No human amounts.

Who was studied

Cartilage tissue and airway cells in the lab.

Limits

Extracts are not essential oil. Species rankings differ by test.

Why researchers looked

Frankincense resin is used in traditional medicine for inflammation; researchers test which species carries the most activity.

Traditional use

Resins have been used in traditional medicine for centuries per the airway-cell paper.

Proposed mechanism Preliminary mechanism

The B. frereana extract lowered MMP9, MMP13, nitrite, prostaglandin E2 and COX-2 in cartilage. Epi-lupeol was identified as the principal constituent.

A proposed mechanism does not show that the effect happens in people.

Do not swallow essential oil and do not put it on the skin undiluted. See the Safety tab.

^{4 25}

Antioxidant and enzyme tests in test tubes

Not enough evidence

Hydrodistilled B. serrata oil scored higher than a hexane extract in several antioxidant tests and blocked more of three enzymes in test tubes. A commercial oil mixing four species also showed antioxidant activity. These are chemistry tests, not effects in the body.

2 studiesLab oils.

Studies, doses and limits

What the trials found

None.

Results

B. serrata oil: 62 compounds, octyl acetate 41.09% and nerolidol 13.64%; stronger than the hexane extract in most antioxidant tests and for three enzymes. Four-species commercial oil: alpha-pinene main compound; antioxidant activity close to a synthetic antioxidant; weaker anti-inflammatory protection than dexamethasone.

Effect sizes as reported

Test-tube units only.

Why this rating

Test-tube chemistry only.

Form and dose studied

Lab oils.

Who was studied

None (test tubes).

Limits

The mixed-species oil cannot be assigned to one species. An erratum for the 2026 B. serrata paper exists and was not read.

Why researchers looked

Researchers test whether plant oils show antioxidant or enzyme-blocking activity as a first screen.

Traditional use

Not described in the papers read.

Proposed mechanism Preliminary mechanism

Test-tube antioxidant assays and enzyme inhibition (cholinesterase, alpha-glucosidase, tyrosinase). Not shown in living cells or people.

A proposed mechanism does not show that the effect happens in people.

Do not swallow essential oil and do not put it on the skin undiluted. See the Safety tab.

^{8 19}

Connections to the rest of health

How Frankincense Species Compared (Carterii, Sacra, Frereana, Serrata) connects to the rest of our health knowledge graph. Every link says what kind of connection it is. A safety link (for example to the liver) is a warning, not a benefit. A study that merely mentions a topic never creates a benefit link.

Explore every connection: goals, body systems, organs, symptoms, genes

Kind of connection Connected to Search

A. Wellness goals

Connected to	Evidence status	Context	Studies
Reduce Fatigue	Mixed findings	Tiredness and fatigue: One trial of frankincense oil on the feet found no effect on tiredness in people having chemotherapy. A trial of a four-oil blend that includes frankincense found less tiredness in women after COVID-19. Neither trial names the species, and the blend is a company product.	^{23 11}
Pain Relief	Low certainty	Back pain and comfort (massage with frankincense and myrrh): Two Turkish trials used massage with a frankincense and myrrh oil mix. In chronic low back pain it beat jojoba-oil massage and no massage. Before a heart procedure it did not lower pain, but people rated their comfort higher. Myrrh was always in the mix and the frankincense species is not named.	^{3 21}
Cellular Protection	Not enough evidence	Cancer cells in dishes and mice (lab only): Distilled B. sacra oil killed breast and pancreatic cancer cells in dishes and slowed a pancreatic tumour in mice. Distilled B. serrata oil was toxic to liver cancer cells in a dish. A B. frereana extract (not oil) slowed breast cancer cell movement in a dish. B. sacra resin extracts were the most potent of nine species in one breast-cell comparison. None of this is a treatment. Antioxidant and enzyme tests in test tubes: Hydrodistilled B. serrata oil scored higher than a hexane extract in several antioxidant tests and blocked more of three enzymes in test tubes. A commercial oil mixing four species also showed antioxidant activity. These are chemistry tests, not effects in the body.	^{26 17 2 22 24 8 19}
Inflammation Balance	Not enough evidence	Inflammation signals in cartilage and airway cells (lab only, extracts): A B. frereana resin extract lowered inflammation signals and collagen breakdown in cartilage tissue in a dish. In human airway cells, extracts from several species were compared and B. serrata was strongest at damping inflammatory messengers in one model. These are extracts, not essential oil.	^{4 25}

B. Body systems

Connected to	Kind of connection	Evidence status	Context	Studies
Nervous System	Biological association	Mixed findings	Studied for: Tiredness and fatigue	^{23 11}
Musculoskeletal System	Biological association	Low certainty	Studied for: Back pain and comfort (massage with frankincense and myrrh) Studied for: Inflammation signals in cartilage and airway cells (lab only, extracts)	^{3 21 4 25}
Immune System	Biological association	Not enough evidence	Studied for: Cancer cells in dishes and mice (lab only) Studied for: Inflammation signals in cartilage and airway cells (lab only, extracts)	^{26 17 2 22 24 4 25 8 19}

C. Body parts and organs

Connected to	Kind of connection	Evidence status	Context	Studies
Skin	Adverse effect or risk	Documented risk	Poison Control: rashes are common with essential oils. Preparation or compound: Essential oils generally; frankincense oil in one case	^{27 6}

E. Health conditions

Connected to	Kind of connection	Evidence status	Context	Studies
Contact dermatitis	Adverse effect or risk	Documented risk	Two case reports; titles and citations only read. Preparation or compound: Boswellia carterii oil on the skin; B. serrata extract in a cream	^{6 1}

I. Biomarkers

Connected to	Kind of connection	Evidence status	Context	Studies
Self-rated fatigue score	Biological association	Mixed findings	Measured in trials: decrease. A lab change is not the same as a health benefit.	^{23 11}
Self-rated pain (visual analogue scale)	Biological association	Low certainty	Measured in trials: decrease. A lab change is not the same as a health benefit.	^{3 21}
Cancer cell viability in a dish	Biological association	Not enough evidence	Measured in trials: decrease. A lab change is not the same as a health benefit.	^{26 2 24}
Inflammation markers in cartilage tissue	Biological association	Not enough evidence	Measured in trials: decrease. A lab change is not the same as a health benefit.	⁴

J. Genes, receptors and enzymes

Connected to	Kind of connection	Evidence status	Context	Studies
CYP1A2, 2C8, 2C9, 2C19, 2D6 and 3A4	Preliminary mechanism	In vitro	Blocked by gum-resin extracts of all four species in test tubes.	⁹
c-Met (MET)	Preliminary mechanism	In vitro	Activation reduced by a B. frereana extract in breast cancer cells.	²²

L. Active compounds

Connected to	Kind of connection	Evidence status	Context	Studies
Alpha-pinene	Biological association	Laboratory	A common scent compound. No effect in people is shown here. Preparation or compound: Oil	^{19 7 14 31}
Octyl acetate	Biological association	Laboratory	A scent compound. Because it appears in oils from different named species and as an adulterant, it cannot identify a species alone. Preparation or compound: Oil	^{8 14 10 20 31}
Isoincensole acetate	Biological association	Laboratory	A marker compound; no effect shown. No PubChem entry was checked for this exact name. Preparation or compound: Resin	¹⁰
Incensole and incensole acetate	Biological association	Laboratory	Marker compounds; no effect shown here. Preparation or compound: Resin, oil	^{10 8 31}
Alpha-phellandrene dimers	Biological association	Laboratory	A fingerprint of B. frereana; no effect shown. Preparation or compound: Resin	^{10 31}
Methylchavicol (estragole) and methyleugenol	Biological association	Laboratory	Marker compounds in this paper. We read no safety statement about them in frankincense. Preparation or compound: Resin	^{10 31}
Nerolidol	Biological association	Laboratory	A scent compound; no effect shown here. Preparation or compound: Oil	^{8 31}
Epi-lupeol	Biological association	In vitro	Principal constituent of the extract that lowered inflammatory markers in cartilage in a dish. Preparation or compound: Resin extract	⁴

Each connection is stored with the ingredient, the connected record, the kind of connection, the evidence status, the supporting studies, the preparation or compound involved, and a review date (last reviewed October 25, 2026).

The evidence

The research centre for Frankincense Species Compared (Carterii, Sacra, Frereana, Serrata). Every record here was checked against PubMed or the publisher's page; we never list a study we have not verified.

Evidence by outcome

Tiredness and fatigue 2 studies · 110 people in trials Mixed findings Back pain and comfort (massage with frankincense and myrrh) 2 studies · 181 people in trials Low certainty Cancer cells in dishes and mice (lab only) 5 studies Not enough evidence Inflammation signals in cartilage and airway cells (lab only, extracts) 2 studies Not enough evidence Antioxidant and enzyme tests in test tubes 2 studies Not enough evidence

Bars show how many studies we found for each outcome, not how well it works. People are added up across trials only (reviews are not added, to avoid double counting).

How we rate evidence

High certainty

Several well-run trials or reviews agree; further research is unlikely to change the picture much.

Moderate certainty

Good trials point the same way, but some doubt remains.

Low certainty

Small, short or inconsistent trials. The finding could change with better research.

Very low certainty

Very little or very weak human data. Treat as a possibility only.

Mixed findings

Trials or reviews disagree with each other.

Not enough evidence

Not enough human research to say either way.

Evidence against

Good research found no benefit, or found harm.

We take the reviewers' own risk-of-bias and GRADE statements where they exist, and otherwise judge from study size, design, consistency, directness and whether a product matches what is sold. Many publications do not make evidence high. Method note: We read the abstracts of 24 PubMed papers (two more were seen as titles only) and the Poison Control, NCCIH, NIEHS and FDA pages. We checked the species names in the GBIF plant database and the compounds in PubChem. We did not read a LiverTox, LactMed or EMA statement on frankincense oil.

Study library: every study we checked 32

Design Research type Year from Search

Study	Design	People	Product, dose, length	Result
Acebo 2004 Allergic contact dermatitis from Boswellia serrata extract in a naturopathic cream. Contact Dermatitis · PMID 15373853 · DOI	Case report	1 One patient (details not available to us)	Boswellia serrata extract in a cream (not essential oil) resin extract n/a n/a · vs n/a	The title reports allergic contact dermatitis from a Boswellia serrata extract in a naturopathic cream. PubMed shows the citation only, with no abstract. A skin allergy case with an extract in a cream Methods, limits and funding Outcomes: Allergic contact dermatitis Limitations: Title and citation only; an extract in a cream, not essential oil. Funding and conflicts: Not available. Read: title-only
Alarcon-Aguilar 2026 Cytotoxic Activity of Boswellia serrata Roxb. Essential Oil and Acetyl-11-Keto-beta-Boswellic Acid (AKBA) on Hepatocellular Carcinoma Cells: In Vitro and In Silico Study. International Journal of Molecular Sciences · PMID 42450245 · DOI	In vitro and in silico in-vitro and in-silico	Huh-7 liver cancer cells in flat culture and as 3D spheroids, plus a computer docking model	Boswellia serrata essential oil (GC-MS analysed) and the boswellic acid AKBA resin oil Not reported here n/a · vs Untreated cells	Both the oil and AKBA were cytotoxic to the cells; AKBA was more potent than the oil. Cell death was linked to caspase-3 apoptosis. The computer model predicted that some oil compounds might block the enzyme 5-lipoxygenase. Cancer cell toxicity in a dish Methods, limits and funding Outcomes: Cell viability, apoptosis markers, cell-cycle and other proteins Limitations: Cells and computer models only. AKBA is a boswellic acid and is not the oil. Funding and conflicts: The authors declare no conflicts of interest. Read: abstract
Alkanat 2023 The effects of massage with frankincense and myrrh oil in chronic low back pain: A three-arm randomised controlled trial. Explore (NY) · PMID 37121835 · DOI	Controlled trial	91 91 adults with chronic low back pain (30 control, 31 massage, 30 aromatherapy massage)	Frankincense and myrrh essential oils, massage (Boswellia species not named in the abstract) resin oils Not reported here Two massage sessions a week · vs Jojoba-oil massage, and no massage	Pain and disability scores fell more in the frankincense-and-myrrh massage group than in the other two groups (p < 0.001 for all three scales). Lower pain and disability scores than jojoba massage or no massage Methods, limits and funding Outcomes: Pain (VAS), Aberdeen Low Back Pain Scale, Roland-Morris Disability Scale Limitations: Myrrh was always in the mix, so frankincense alone cannot be credited. The abstract does not name the species. Funding and conflicts: Not stated in the abstract. Read: abstract
Blain 2010 Boswellia frereana (frankincense) suppresses cytokine-induced matrix metalloproteinase expression and production of pro-inflammatory molecules in articular cartilage. Phytotherapy Research · PMID 19943332 · DOI	Laboratory research in-vitro	Cartilage explants stimulated with inflammatory signals for 28 days	Boswellia frereana extracts (not essential oil) resin extract Not reported here n/a · vs Untreated explants	The extract reduced collagen breakdown and lowered MMP9, MMP13, nitrite, prostaglandin E2 and COX-2. Epi-lupeol was identified as the principal constituent of the B. frereana extract. The authors propose further study for arthritis. Anti-inflammatory signals in cartilage in a dish Methods, limits and funding Outcomes: Collagen breakdown, MMP9 and MMP13 genes, nitrite, prostaglandin E2, COX-2 Limitations: An extract, not essential oil, tested on tissue in a dish. No person was treated. Funding and conflicts: No conflict statement in the abstract; research support listed on PubMed. Read: abstract
Brendler 2018 Sustainable supply, a foundation for natural product development: The case of Indian frankincense (Boswellia serrata Roxb. ex Colebr.). Journal of Ethnopharmacology · PMID 30031142 · DOI	Review and trade analysis review	Published information and trade data on Boswellia serrata	Indian frankincense, Boswellia serrata oleo-resin oleo-resin Not reported here n/a · vs n/a	India is the only producer of B. serrata oleo-resin. Exports were 102.8 metric tonnes in 2015-2016 and 74.56 in 2016-2017. Demand by far exceeds what can be harvested without endangering the species, opening the door to adulteration and substitution. Market demand and harvest practice have pressured Indian frankincense into imminent decline and start to affect African frankincense as buyers seek substitutes. Supply under pressure Methods, limits and funding Outcomes: Habitat, population trends, harvest, trade, management Limitations: Species-specific to B. serrata; collection data were hard to find. Funding and conflicts: The abstract carries no funding statement; PubMed lists an author affiliation with a herbal tea company (Traditional Medicinals). Read: abstract
Buonomo 2021 Allergic contact dermatitis from Boswellia carterii (frankincense) oil. Contact Dermatitis · PMID 33963563 · DOI	Case report	1 One patient (details not available to us)	Boswellia carterii (frankincense) oil on the skin resin oil n/a n/a · vs n/a	The title reports allergic contact dermatitis from Boswellia carterii oil. PubMed shows the citation only, with no abstract, so we could not read case details. A skin allergy case Methods, limits and funding Outcomes: Allergic contact dermatitis Limitations: Title and citation only. Funding and conflicts: Not available. Read: title-only
DeCarlo 2025 Compositional Analysis of Cultivated and Wild-Harvested Boswellia sacra Frankincense Resin Essential Oils in Oman. Chemistry and Biodiversity · PMID 41124237 · DOI	Laboratory laboratory	Resin from cultivated and wild trees in southern Oman, plus commercial oils	Boswellia sacra resin essential oils resin oil Not reported here n/a · vs Wild-harvested commercial oils	Oils from cultivated trees were similar to wild-derived commercial oils, with no loss of chemical complexity. A previously unreported delta-3-carene/alpha-pinene type was found in individual wild trees. All frankincense is currently harvested from wild trees, with serious social and environmental problems and population declines in multiple species. Moving to cultivation may have mixed social and conservation effects. Cultivated and wild oils similar Methods, limits and funding Outcomes: Oil composition Limitations: Few individual trees; chemistry only. Funding and conflicts: No conflict statement read in the abstract. Read: abstract
El-Nashar 2026 Comparative metabolic profiling, enzyme inhibitory activities, and in-silico analysis of the hexane extract and the hydrodistilled oil of Boswellia serrata. PLoS One · PMID 42102034 · DOI	Laboratory laboratory	Chemical and enzyme tests in test tubes, plus computer docking	Boswellia serrata gum: hydrodistilled essential oil compared with an n-hexane extract resin oil and extract Not reported here n/a · vs Hexane extract of the same gum	The oil held 62 compounds, led by acetic acid octyl ester (41.09%) and nerolidol (13.64%). The hexane extract led with incensole (28.56%). The oil scored higher in several antioxidant tests and blocked more cholinesterase, alpha-glucosidase and tyrosinase in test tubes. The authors suggest it may help with oxidative stress and age-related conditions. Test-tube activity only Methods, limits and funding Outcomes: Composition by GC-MS, antioxidant tests, enzyme-inhibition tests Limitations: Test-tube chemistry; no cells, animals or people. An erratum for this paper was published on 26 June 2026 and we did not read it. Funding and conflicts: No competing interest declared. Read: abstract
Frank 2006 Analysis of frankincense from various Boswellia species with inhibitory activity on human drug metabolising cytochrome P450 enzymes using liquid chromatography mass spectrometry after automated on-line extraction. Journal of Chromatography A · PMID 16364338 · DOI	Laboratory research in-vitro	Enzyme tests in the lab with extracts of commercially bought frankincense	Gum-resin extracts of Boswellia carteri, B. frereana, B. sacra and B. serrata (not essential oil) gum-resin extracts Not reported here n/a · vs n/a	Extracts of all four species were equally potent, non-selective inhibitors of these major drug-metabolising enzymes. Boswellic acids were inhibitors too, but the authors say they are not the main inhibiting ingredient. Enzyme inhibition in the lab Methods, limits and funding Outcomes: Inhibition of liver enzymes CYP1A2, 2C8, 2C9, 2C19, 2D6 and 3A4 Limitations: Test-tube work with resin extracts, not the oil and not people. It shows a possible interaction route, not a proven one. Funding and conflicts: Research support listed on PubMed. Read: abstract
Hamm 2005 A chemical investigation by headspace SPME and GC-MS of volatile and semi-volatile terpenes in various olibanum samples. Phytochemistry · PMID 15922374 · DOI	Laboratory laboratory	6 Six olibanum (frankincense resin) samples with certified botanical origin, plus market and archaeological samples	Resin of B. carteri, B. sacra, B. serrata, B. papyrifera and B. frereana, tested by headspace SPME GC-MS resin Not reported here n/a · vs Between species	B. carteri and B. sacra resin were quite similar, with isoincensole acetate as the main diterpene marker. B. serrata also had it, but methylchavicol, methyleugenol and an unidentified oxygenated sesquiterpene set it apart. B. papyrifera was marked by incensole and its oxide and acetate, n-octanol and n-octyl acetate. B. frereana lacked incensole-family diterpenes and held many dimers of alpha-phellandrene. Each species has a different fingerprint Methods, limits and funding Outcomes: Mono-, sesqui- and diterpene composition Limitations: Resin, not distilled oil, and only six certified samples. Funding and conflicts: No conflict statement in the abstract. Read: abstract
Hawkins 2022 Aromatherapy blend of thyme, orange, clove bud, and frankincense boosts energy levels in post-COVID-19 female patients: A randomized, double-blinded, placebo controlled clinical trial. Complementary Therapies in Medicine · PMID 35341944 · DOI	Controlled trial	40 40 women with fatigue more than 5 months after COVID-19	Inhaled four-oil blend (thyme, orange, clove bud, frankincense) made by Young Living Essential Oils; frankincense species not named essential oil blend Not reported here Twice a day for 14 days · vs Placebo	Lower fatigue scores with the blend than placebo after adjusting for other factors (p = .020, partial eta squared 0.198). Lower fatigue score with the blend Methods, limits and funding Outcomes: Fatigue (Multidimensional Fatigue Symptom Inventory) Limitations: A proprietary blend made by Young Living Essential Oils, a company named in the abstract. Frankincense was not tested alone, and the species is not named. Funding and conflicts: The product was manufactured by Young Living Essential Oils; the abstract does not state who paid for the trial. Treat as industry-linked. Read: abstract
Johnson 2019 Organic Certification is Not Enough: The Case of the Methoxydecane Frankincense. Plants (Basel) · PMID 30987305 · DOI	Field sampling and chemistry laboratory	Resin sampled directly from trees in areas making a methoxydecane oil type, plus commercial oils	Frankincense oils sold as Boswellia carteri, including certified organic oil essential oil Not reported here n/a · vs n/a	Methoxydecane comes not from B. carteri but from a newly described species, Boswellia occulta. B. occulta oil appears in oil sold as pure B. carteri, including certified organic oil. The authors say organic certification does not secure purity or sustainable harvest in wildcrafted species. They describe B. sacra (syn. B. carteri) as coming from Somalia and Somaliland and many areas as overharvested. Wrong species found in oils labelled carteri Methods, limits and funding Outcomes: Source of a new marker compound, methoxydecane Limitations: Does not give a market-wide rate. Funding and conflicts: The authors declare no conflict of interest. Read: abstract
Johnson 2022 Conservation Assessment and Chemistry of Boswellia ogadensis, a Critically Endangered Frankincense Tree. Plants (Basel) · PMID 36501419 · DOI	Field survey and chemistry field survey	Field survey in southern Ethiopia, June 2022, and resin analysis	Boswellia ogadensis (a different species from the four compared here) resin oil Not reported here n/a · vs n/a	B. ogadensis was listed Critically Endangered in 2018. The 2022 survey found it in more places and more abundant than thought, and the authors say downlisting to Endangered may be appropriate. Its oil profile is similar to other Boswellia species but has markers that can tell it apart. Species-level conservation example Methods, limits and funding Outcomes: Abundance, threats, oil profile Limitations: A different species, used here only to show how little is known and how fast status can change. Funding and conflicts: The authors declare no conflict of interest. Read: abstract
Mikhaeil 2003 Chemistry and immunomodulatory activity of frankincense oil. Zeitschrift fur Naturforschung C · PMID 12710734 · DOI	Laboratory laboratory	One steam-distilled frankincense oil, tested in the lab	Frankincense essential oil (species not named in the abstract) resin oil Not reported here n/a · vs n/a	Steam distillation gave 3% oil. The oil held diterpenes 42.5%, monoterpenes 13.1% and sesquiterpenes 1%; the main compounds were a duva-type diterpene acetate (21.4%) and octyl acetate (13.4%). It showed strong immunostimulant activity (90% lymphocyte transformation) in a test. One oil analysed in full Methods, limits and funding Outcomes: Composition and lymphocyte proliferation Limitations: The abstract does not name the species. Funding and conflicts: No conflict statement in the abstract. Read: abstract
Nastic 2026 Chemical Profiling and Authentication of Boswellia Species and Frankincense Products: Advances in Metabolomics and Quality Markers. Plants (Basel) · PMID 42884781 · DOI	Review review	Review of chemical profiling and authentication of Boswellia resins and products	Frankincense resins and products from Boswellia species resin and products Not reported here n/a · vs n/a	Trade has raised concerns about species substitution, wrong place labels, adulteration and uneven quality. Species overlap a lot in their chemicals, and single markers and simple total-acid tests are not enough. Combined methods that use several measures give far more confidence. Single markers are not enough Methods, limits and funding Outcomes: Authentication methods Limitations: A review of methods; no market survey. Funding and conflicts: The authors declare no conflicts of interest. Read: abstract
Negussie 2021 Continuous resin tapping for frankincense harvest increases susceptibility of Boswellia papyrifera trees to longhorn beetle damage. Heliyon · PMID 33665427 · DOI	Field study field study	Boswellia papyrifera trees in northern Ethiopia	Boswellia papyrifera (a different species from the four compared here) tree tapping Not reported here n/a · vs Rested versus continuously tapped trees	Tapping without enough resting years made trees more prone to longhorn beetle damage; more than 12 wounds per tree was linked to high damage (up to 90% in Central Tigray). Trees rested 10 or more years had less damage. Over-tapping harms trees Methods, limits and funding Outcomes: Longhorn beetle damage Limitations: A different frankincense species; shows the kind of harm over-tapping can do. Funding and conflicts: The authors declare no conflict of interest. Read: abstract
Ni 2012 Frankincense essential oil prepared from hydrodistillation of Boswellia sacra gum resins induces human pancreatic cancer cell death in cultures and in a xenograft murine model. BMC Complementary and Alternative Medicine · PMID 23237355 · DOI	In vitro and animal in-vitro and mouse	Human pancreatic cancer cell lines in the lab, and nude mice with a transplanted human tumour	Boswellia sacra essential oil fractions, hydrodistilled at 78 or 100 degrees C resin oil Not reported here n/a · vs Untreated cells or animals	Longer and hotter distillation gave more large molecules, including boswellic acids. Pancreatic cancer cells lost viability with the later fractions, and fraction IV slowed tumour growth in mice. The responsible compounds were not identified. Cancer cell and mouse tumour effects Methods, limits and funding Outcomes: Cell viability, cell death, tumour markers in mice Limitations: Lab and animal work only; no person was treated. The authors say the responsible chemicals are not identified. Funding and conflicts: Non-US government research support listed on PubMed. Read: abstract
Niebler 2016 Frankincense Revisited, Part I: Comparative Analysis of Volatiles in Commercially Relevant Boswellia Species. Chemistry and Biodiversity · PMID 27012219 · DOI	Laboratory laboratory	46 46 mostly commercially obtained gum resins and essential oils	Gum resins and essential oils sold as B. sacra, B. serrata, B. papyrifera and B. frereana resin and oil Not reported here n/a · vs Between species	216 compounds were identified or tentatively identified. Statistics allowed a clear distinction between the four species by volatile profile. With few exceptions, the named species matched reliable literature and botanically identified samples. The authors suggest marker compounds to tell commercial resins and oils apart, and note that earlier literature gave contradictory results. Four species could be told apart by volatile pattern Methods, limits and funding Outcomes: Volatile compounds by SPME GC-MS Limitations: Sold names were checked against the chemistry itself; samples were mostly commercial. The abstract does not list the marker compounds. Funding and conflicts: No conflict statement in the abstract. Read: abstract
Obistioiu 2023 Boswellia Essential Oil: Natural Antioxidant as an Effective Antimicrobial and Anti-Inflammatory Agent. Antioxidants (Basel) · PMID 37891886 · DOI	Laboratory laboratory	Chemical, cell-membrane and microbe tests in the lab, plus molecular docking	One commercial Boswellia essential oil said to contain B. carteri, B. sacra, B. papyrifera and B. frereana essential oil blend of species Not reported here n/a · vs Dexamethasone and synthetic antioxidant controls	Alpha-pinene was the main compound, followed by limonene. The oil showed antioxidant activity close to a synthetic antioxidant in a test tube, and anti-inflammatory protection lower than dexamethasone in membrane and protein tests. Test-tube activity of a mixed-species oil Methods, limits and funding Outcomes: GC-MS composition, antioxidant, anti-inflammatory and antimicrobial tests Limitations: A mix of four species, so nothing here belongs to one species. Test-tube work only. Funding and conflicts: No conflict statement read; the abstract was read in part. Read: abstract
Ojha 2022 Comparison of Volatile Constituents Present in Commercial and Lab-Distilled Frankincense (Boswellia carteri) Essential Oils for Authentication. Plants (Basel) · PMID 36015437 · DOI	Product analysis laboratory	23 21 commercial oils sold as Boswellia carteri and 2 oils distilled in the lab	Commercial frankincense (B. carteri) essential oils analysed by GC-MS and chiral GC-MS essential oil Not reported here n/a · vs Lab-distilled oil	Of 21 commercial samples, 6 held synthetic limonene, 3 held synthetic octyl acetate, 3 held castor oil, 2 held frankincense resin and 2 held Boswellia occulta; 1 held B. serrata. One had phthalates and a cheap similar oil. One held copaiba resin, frankincense resin and synthetic octyl acetate, and one held B. serrata plus castor oil and resin. Eight chiral compounds in the lab-distilled oils can serve as fingerprints. Many commercial samples were adulterated or mixed Methods, limits and funding Outcomes: Adulteration and authenticity Limitations: Samples came from one lab's collection; the share is not a market-wide rate. Funding and conflicts: The authors declare no conflict of interest. Read: abstract
Ozdemir 2024 The effect of back massage with frankincense and myrrh oil before the cardiac electrophysiological procedure on back pain intensity and comfort: A single-blind randomized controlled trial. Explore (NY) · PMID 37783585 · DOI	Controlled trial	90 90 people due to have a cardiac electrophysiological procedure (30 per group)	Back massage with frankincense and myrrh essential oil (species not named in the abstract) resin oils Not reported here n/a · vs Jojoba-oil massage, and no massage	No statistically significant difference in pain scores after the procedure. Overall comfort, physical comfort and psychospiritual comfort were higher with the frankincense and myrrh massage. The authors say more rigorous research is needed on pain. Pain: no difference. Comfort: higher Methods, limits and funding Outcomes: Back pain (VAS) and general comfort Limitations: Myrrh was always in the mix. The abstract does not name the species. Funding and conflicts: Not stated in the abstract. Read: abstract
Parr 2018 Boswellia frereana suppresses HGF-mediated breast cancer cell invasion and migration through inhibition of c-Met signalling. Journal of Translational Medicine · PMID 30314527 · DOI	Laboratory research in-vitro	Two triple-negative human breast cancer cell lines (BT549, MDA-MB-231)	An extract of traditional Somalian frankincense, Boswellia frereana (not essential oil) resin extract Not reported here n/a · vs Untreated cells	The extract reduced the cancer cells' movement, invasion and tube formation after growth-factor stimulation, and blocked c-Met receptor activation. The authors say the extract could play a role in breast cancer treatment; this is a lab result. Cancer cell movement reduced in a dish Methods, limits and funding Outcomes: Cell movement, invasion, new-vessel formation, c-Met signalling Limitations: Extract, cells in a dish. Not a treatment result. Funding and conflicts: Research support listed on PubMed; no conflict statement in the abstract. Read: abstract
Reis 2023 Cancer-Related Fatigue: A Pilot Study Evaluating the Effect of Frankincense Essential Oil in Patients With Cancer Receiving Chemotherapy. Cancer Nursing · PMID 35245227 · DOI	Controlled trial	70 70 adults having chemotherapy for cancer	Frankincense essential oil on the soles of the feet (species not named in the abstract) resin oil Not reported here Twice a day from 2 days before to 2 days after each chemotherapy · vs Carrier oil without frankincense	No statistically significant change in fatigue over time or between the frankincense and carrier-oil groups. Baseline fatigue was the only predictor of fatigue afterwards. The authors say no evidence supported frankincense for chemotherapy fatigue. No benefit found Methods, limits and funding Outcomes: Self-rated fatigue Limitations: A pilot study. The abstract does not name the Boswellia species or give the oil strength. Funding and conflicts: The authors report no conflicts of interest. Read: abstract
Schmiech 2019 Comparative Analysis of Pentacyclic Triterpenic Acid Compositions in Oleogum Resins of Different Boswellia Species and Their In Vitro Cytotoxicity against Treatment-Resistant Human Breast Cancer Cells. Molecules · PMID 31181656 · DOI	Laboratory laboratory	41 41 oleogum resin samples from nine Boswellia species, tested on a breast cancer cell line in the lab	Resin extracts of B. sacra, B. dalzielii, B. papyrifera, B. serrata, B. carterii, B. neglecta, B. rivae, B. frereana and B. occulta (not essential oil) oleogum resin extracts Not reported here n/a · vs Other species	Species and growth location could be told apart by their triterpenic acid pattern. Extracts of all resins were toxic to MDA-MB-231 breast cancer cells; B. sacra extracts were most potent (average IC50 8.3 +/- 0.6 micrograms per millilitre). Toxicity rose with the triterpenic acid content. Species differ in acid content and cell toxicity in a dish Methods, limits and funding Outcomes: Eight boswellic and lupeolic acids; cell toxicity (IC50) Limitations: Resin extracts, not essential oil. Cells in a dish. Funding and conflicts: The authors declare no conflict of interest. Read: abstract
Stengler 2026 Anti-inflammatory properties of Boswellia frereana, Boswellia neglecta, Boswellia rivae, Boswellia sacra, Boswellia serrata, Commiphora confusa, Commiphora kataf and Commiphora myrrha extracts in viral and chronic respiratory inflammation. Journal of Ethnopharmacology · PMID 40876795 · DOI	Laboratory research in-vitro	Human airway cells in the lab, in virus-mimic and LPS-stimulated models	Extracts from several Boswellia and Commiphora species, including B. frereana, B. sacra and B. serrata (not essential oil) resin extracts Not reported here n/a · vs Untreated cells	B. serrata showed the strongest inhibition of inflammatory cytokines in the virus-mimic model. Myrrh (C. myrrha) acted through a different pattern in the LPS model. The authors say this shows species differ in their effects. Species differ in a dish Methods, limits and funding Outcomes: Cell viability and inflammatory messengers (cytokines) Limitations: Extracts on cells only. The abstract does not rank B. frereana or B. sacra. Funding and conflicts: The authors declare no competing financial interests. Read: abstract
Suhail 2011 Boswellia sacra essential oil induces tumor cell-specific apoptosis and suppresses tumor aggressiveness in cultured human breast cancer cells. BMC Complementary and Alternative Medicine · PMID 22171782 · DOI	Laboratory research in-vitro	Human breast cancer cell lines (T47D, MCF7, MDA-MB-231) and a normal breast cell line (MCF10-2A) in the lab	Boswellia sacra essential oil hydrodistilled from Omani Hougari-grade resin at 78 or 100 degrees C for 12 hours resin oil Not reported here n/a · vs Untreated cells	Oil made at 100 degrees C had more large molecules, including boswellic acids, and was more potent than oil made at 78 degrees C. All three cancer cell lines lost viability; the normal cell line was more resistant. The authors call for pre-clinical and clinical studies. Cancer cell killing in a dish Methods, limits and funding Outcomes: Cell viability, cell death, network and spheroid formation, proteins Limitations: Cells in a dish, not people. Long, hot distillation makes a different oil from ordinary shop oil. Not a treatment result. Funding and conflicts: No conflict statement in the abstract. Read: abstract
n/a Poison Control (America's Poison Centers): Essential oils: Poisonous when misused n/a · Source	Authoritative guidance n/a	n/a	n/a n/a n/a n/a · vs n/a	Many essential oils can cause rashes, and some are poisonous if absorbed or swallowed. Aspirating an oil can cause pneumonia. Children have thin skin and immature livers and may be more susceptible. Oils may interact with medications. It can be hard to know the species, concentration or contaminants in a bottle. Diluting in a carrier oil is the best way to avoid a skin reaction; do not use on damaged skin. Stop and wash off if a rash occurs. Keep bottles out of sight and reach of children and pets. If swallowed, call 1-800-222-1222. Methods, limits and funding Outcomes: Safety of essential oils Limitations: General page on essential oils; frankincense is not named. No date on the page; references were accessed in July 2024. Read: full-text
n/a 2020 NCCIH: Aromatherapy n/a · Source	Authoritative guidance n/a	n/a	n/a n/a n/a n/a · vs n/a	Aromatherapy is the use of plant essential oils, most often inhaled or applied diluted to the skin. For insomnia, NCCIH says we do not know whether it helps because little rigorous research has been done. Methods, limits and funding Outcomes: What aromatherapy is and the state of research Limitations: General page; does not mention frankincense. Last updated January 2020. Read: full-text
n/a 2023 FDA: Aromatherapy n/a · Source	Authoritative guidance n/a	n/a	n/a n/a n/a n/a · vs n/a	Claims that a product will ease pain, treat depression or anxiety, or help you sleep are drug claims. Natural or organic does not mean safe: many plant materials are toxic, irritating or allergenic on the skin. The law does not require cosmetics to have FDA approval before they go on sale. Methods, limits and funding Outcomes: How aromatherapy products are regulated Limitations: General page; does not mention frankincense. Content current as of September 8, 2023. Read: full-text
n/a 2026 NIEHS: Essential oils n/a · Source	Authoritative guidance n/a	n/a	n/a n/a n/a n/a · vs n/a	Each essential oil has its own chemical makeup, and composition may vary within the same plant species or from plant to plant. Synthetic oils are not considered true essential oils. Lavender and tea tree oil and some of their components showed hormone-like activity in lab tests, and skin use of some oils was linked to breast growth in a few boys. Methods, limits and funding Outcomes: Composition and hormone-like activity Limitations: Does not mention frankincense. Last reviewed March 19, 2026. Read: full-text
n/a 2026 PubChem: alpha-pinene CID 6654; octyl acetate CID 8164; limonene CID 22311; alpha-phellandrene CID 7460; estragole (methylchavicol) CID 8815; methyl eugenol CID 7127; nerolidol CID 5284507; incensole acetate CID 53386731 (PUG REST, read 2026-10-25) n/a · Source	Chemical registry n/a	n/a	n/a n/a n/a n/a · vs n/a	Alpha-pinene, limonene and alpha-phellandrene are C10H16 (136.23); octyl acetate is C10H20O2 (172.26); estragole is C10H12O (148.20); methyl eugenol is C11H14O2 (178.23); nerolidol is C15H26O (222.37); incensole acetate is C22H36O3 (348.5). Methods, limits and funding Outcomes: Identity of compounds Limitations: Chemical registry; says nothing about effects. Read: full-text
n/a 2026 GBIF Backbone Taxonomy: Boswellia names (match API, read 2026-10-25) n/a · Source	Taxonomy database n/a	n/a	n/a n/a n/a n/a · vs n/a	Boswellia sacra Flueck. is ACCEPTED (key 8330171). Boswellia carteri Birdw. is a SYNONYM of B. sacra (key 5421353). Boswellia frereana Birdw. is ACCEPTED (key 5421351). Boswellia serrata Roxb. ex Colebr. is ACCEPTED (key 5421354). Boswellia papyrifera (Delile) Hochst. is ACCEPTED (key 5421356). Boswellia occulta Thulin, DeCarlo and S.P.Johnson is ACCEPTED (key 10823074). All are in the family Burseraceae. Methods, limits and funding Outcomes: Accepted names Limitations: Names only. Read: full-text

What we do not know yet

No human trial names the Boswellia species of the oil used.
No study of B. frereana essential oil in animals or people was found; its lab work uses resin extracts.
The side-by-side species comparisons are mostly on resin, not on finished oils.
No safety comparison between species, and no data on pregnancy, breastfeeding, children or pets.
The cancer-cell work is lab and animal only.
Species-level conservation status for B. sacra, B. carterii and B. frereana was not read.

How new research is added

New studies are found by a saved PubMed search and are placed in a review queue. A person reads each one before it is added.

Lab markers

What changed in blood or saliva tests during trials. A changed number is not the same as feeling or being healthier, and we give no "normal ranges".

Other 4

●

Self-rated fatigue score

Decrease in trials

A questionnaire score of how tired a person feels; lower means less fatigue.

Mixed findings

Results and what it means

Why it was measured

Main outcome in both fatigue trials.

Statistical vs. clinical meaning

A feeling score, not a lab test, open to expectation effects.

Safety implication

A better score does not show the oil is safe for everyone.

Study	Result	People	Product
²³	No significant change over time or between frankincense oil and carrier oil in 70 people having chemotherapy.
¹¹	Lower score with a four-oil blend than placebo in 40 women after COVID-19 (p = .020).

^{23 11}

●

Self-rated pain (visual analogue scale)

Decrease in trials

A line on which people mark how much pain they feel; lower means less pain.

Low certainty

Results and what it means

Why it was measured

Main outcome in both massage trials.

Statistical vs. clinical meaning

Self-rated, and people know they are being massaged.

Safety implication

Pain relief does not show safety.

Study	Result	People	Product
³	Pain, back-pain scale and disability scores fell more with frankincense and myrrh massage than with jojoba massage or no massage.
²¹	No significant difference in pain scores after a cardiac procedure; comfort scores were higher.

^{3 21}

●

Cancer cell viability in a dish

Decrease in trials

The share of cultured cancer cells that stay alive after exposure to a test substance.

Not enough evidence

Results and what it means

Why it was measured

A first screen in the lab for whether an oil or extract is toxic to cancer cells.

Statistical vs. clinical meaning

Cells in a dish; a lab screen, not a health outcome.

Safety implication

Toxic to cancer cells in a dish does not mean safe or useful in people.

Study	Result	People	Product
²⁶	B. sacra oil lowered viability of three breast cancer cell lines more than a normal breast cell line.
²	B. serrata oil and AKBA lowered viability of liver cancer cells; AKBA was more potent.
²⁴	Resin extracts of nine species were toxic to breast cancer cells; B. sacra extracts were most potent.

^{26 2 24}

●

Inflammation markers in cartilage tissue

Decrease in trials

Chemical messengers such as prostaglandin E2, nitrite, COX-2 and matrix-breaking enzymes measured in cartilage kept alive in a dish.

Not enough evidence

Results and what it means

Why it was measured

Used to screen extracts for activity against cartilage breakdown.

Statistical vs. clinical meaning

Tissue in a dish.

Safety implication

None known; not a safety study.

Study	Result	People	Product
⁴	B. frereana extract lowered MMP9, MMP13, nitrite, prostaglandin E2 and COX-2 in cartilage explants.

⁴

Safety

What studies and official sources say about side effects, medicines and who should check first. Each point shows what kind of evidence it comes from.

Main points to know 8

Do not swallow any frankincense oil. Essential oils can poison, and breathing one into the lungs can cause pneumonia.. Poison Control says some essential oils are poisonous if swallowed or absorbed, that aspirating one can cause pneumonia, and that children have thin skin and immature livers. We found no swallowing data for any of the four species, so no amount is known to be safe, and this page gives none. If someone has swallowed essential oil, call Poison Help (US: 1-800-222-1222) or your emergency number. Keep bottles out of sight and reach of children and pets. Authoritative guidance ²⁷
No species is shown to be safer. Safety data are missing for all four.. We found no study that compares the skin or swallowing safety of B. carterii, B. sacra, B. frereana and B. serrata oils. Not finding a warning is not proof of safety, and a species that has been studied less is not a safer choice. None found
Skin allergy has been reported with B. carterii oil, and with a B. serrata extract in a cream.. One case report describes allergic contact dermatitis from Boswellia carterii oil, and another from a Boswellia serrata extract in a naturopathic cream. We could read only the titles, so details are unknown. Poison Control says to stop and wash the oil off if a rash appears. Case report ^{6 1 27}
Do not put it on the skin undiluted, or on damaged skin.. Poison Control says pure essential oils are potent, that diluting in a carrier oil is the best way to avoid a bad reaction, and that essential oils should not go on damaged skin. We found no published safe skin strength for any of the four species, so this page gives none. Authoritative guidance ²⁷
The label may name the wrong species, or the bottle may be mixed.. In one analysis of 21 commercial oils sold as Boswellia carteri, 6 held synthetic limonene, 3 synthetic octyl acetate and 3 castor oil; some held another Boswellia species. Another paper found Boswellia occulta oil in bottles sold as pure B. carteri, including certified organic oil. So you may not know which species or which extras you are using. Product analysis ^{20 12}
Children, pets, pregnancy and breastfeeding: no species-specific safety data were found.. None of the sources we read tested any of the four oils in pregnancy, breastfeeding, babies, children or pets. Poison Control notes children may be more susceptible. Ask a doctor, midwife, pharmacist or vet before using any essential oil around them. None found ²⁷
Possible medicine interactions: seen in the lab with resin extracts of all four species, unstudied for the oils.. In test tubes, gum-resin extracts of B. carteri, B. frereana, B. sacra and B. serrata were equally potent, non-selective blockers of major drug-processing liver enzymes. These were extracts, not oils, and no person was studied. Poison Control also says essential oils may interact with medications. Tell your pharmacist about any oil you use, especially before surgery. Laboratory research ^{9 27}
Hormone-like effects were tested for lavender and tea tree oil, not for frankincense.. NIEHS describes lab work showing hormone-like activity in lavender and tea tree oils and links skin use of some oils to breast growth in a few boys. The work did not test frankincense oils, so we cannot say they are free of this or that they have it. Authoritative guidance ³⁰

Side effects 4

Effect	How often	Severity and recovery	Evidence
Allergic skin reaction (contact dermatitis) One reported case with B. carterii oil and one with a B. serrata extract in a cream (titles only read). No rate is known for any species.	Not established	not stated Poison Control: stop use and wash off if a rash appears	Case report ^{6 1 27}
Poisoning if swallowed (essential oils in general) Poison Control's examples are other oils (camphor, pennyroyal, wintergreen, eucalyptus). No frankincense swallowing case was found.	Not established	serious in some oils Not stated for frankincense	Authoritative guidance ²⁷
Pneumonia from breathing oil into the lungs Can happen if someone chokes while trying to swallow an essential oil.	Not established	serious Not stated	Authoritative guidance ²⁷
No side effects listed in the trial abstracts Silence in an abstract does not show the oil is free of side effects.	Abstracts do not list side effects	not stated n/a	Controlled trial ^{23 3 21}

Liver

We found no liver injury report for any of the four essential oils. A LiverTox record was not read. In the lab, resin extracts of all four species blocked drug-processing liver enzymes (see interactions); that is not a report of liver injury. Poison Control says children may be more susceptible because their livers are immature. ^{9 27}

How often. Not established.

Monitoring. No agency monitoring advice was read.

This is a safety connection. It is not evidence that Frankincense Species Compared (Carterii, Sacra, Frereana, Serrata) supports liver health.

Medicines and supplements 2

With	Why it matters	Importance	Evidence	What to do
Medicines cleared by liver enzymes CYP1A2, 2C8, 2C9, 2C19, 2D6 and 3A4 prescription	Gum-resin extracts of B. carteri, B. frereana, B. sacra and B. serrata blocked these enzymes in test tubes, equally and non-selectively. Boswellic acids were inhibitors but not the main blocking ingredient.	Lab only, with resin extracts, not the oil. No person was studied and the effect of the oils is not known.	Laboratory research Not enough evidence ⁹	Do not assume the oils are free of interactions. A pharmacist can check your medicines.
Prescription medicines in general prescription	Not established for any of the four oils.	Poison Control says essential oils may interact with medications. No case or trial for these oils was found.	Authoritative guidance Not enough evidence ²⁷	Ask a pharmacist before using it, and tell your surgical team about any oil you use.

Who should check first 5

Situation	Advice	Evidence
Swallowing essential oil, especially by or near children and pets	Do not swallow. If someone may have swallowed any essential oil, call poison control (US: 1-800-222-1222) or your emergency number.	Authoritative guidance ²⁷
Undiluted use on skin, or use on damaged skin	Do not use undiluted, and not on broken skin.	Authoritative guidance ²⁷
A past rash from frankincense or another essential oil	Avoid it and ask a doctor or pharmacist; allergy to one oil does not prove it for another, but it is a reason to be careful.	Case report ^{6 27}
Asthma or epilepsy	No species-specific source was read on breathing irritation or seizures from these oils. Ask your doctor before using any essential oil if you have either.	None found
Pregnancy, breastfeeding, babies, young children or pets	No data for any of the four oils. Ask a doctor, midwife, pharmacist or vet first.	None found ²⁷

Overdose, product quality and regulators

Summary. No poisoning case from a swallowed frankincense oil was found in the sources read, and no toxic amount is established for any species. Poison Control's general warning about essential oils applies.

Amounts. No safe amount is established, and this page gives none.

Onset and course. Not established.

Repeated use. Repeated skin use has produced allergy in at least one reported case (B. carterii oil).

Animal data. Mouse and cell studies used B. sacra oil to kill tumour cells; they are not safety studies. No pet-specific data was found.

Toxic parts. The oil is the concentrated form of the resin.

Not read. LiverTox, LactMed, EMA and veterinary sources on these oils were not read or not found.

Naming and purity are the biggest practical problems. What is in a bottle labelled with one species can differ from the label.

Adulteration of commercial oils. Among 21 commercial oils sold as Boswellia carteri, 6 held synthetic limonene, 3 synthetic octyl acetate and 3 castor oil; 2 each held resin or Boswellia occulta, 1 held B. serrata, and one had phthalates and a cheap similar oil. ²⁰

A different species sold as carteri, including organic. The compound methoxydecane, found in oils sold as B. carteri, comes from Boswellia occulta. B. occulta oil was present in oil sold as pure B. carteri, including certified organic oil. The authors conclude organic certification is not enough to secure purity. ¹²

Why one marker is not enough. A 2026 review says species overlap a lot in their chemicals and that single markers are insufficient to authenticate frankincense; combined methods are far better. ¹⁵

Demand and substitution. A review of Indian frankincense says demand far exceeds what can reasonably be harvested without endangering populations, which opens the door to adulteration and substitution. ⁵

Unknown species and strength. Poison Control says it can be hard to know the species, strength or contaminants in an essential oil bottle. NIEHS says an oil's composition may vary within a species. ^{27 30}

Body	Action	Date
Poison Control (America's Poison Centers) (United States)	Essential oils can poison if swallowed or absorbed; dilute in a carrier oil; not on damaged skin; stop and wash if a rash appears; call 1-800-222-1222 if swallowed. source
FDA (United States)	Claims that a product eases pain, treats depression or anxiety or helps sleep are drug claims. Natural or organic does not mean safe. source	2023-09-08
NCCIH (NIH) (United States)	Aromatherapy is usually inhaled or applied diluted; for insomnia we do not know if it helps because little rigorous research exists. source	2020-01
NIEHS (NIH) (United States)	Some essential oils and components show hormone-like activity (lavender and tea tree tested). Composition varies within a species. source	2026-03-19

When to get medical help

If someone may have swallowed essential oil, call poison control straight away (US: Poison Help 1-800-222-1222) or your local emergency number. Do not make them vomit.
Trouble breathing, collapse, a seizure, or being very hard to wake: call emergency services at once.
Coughing, choking or breathlessness after a child or pet has had contact with oil.
A spreading, blistering or swelling rash, or a rash on the face or around the eyes: stop use, wash the oil off with soap and water and ask a clinician.
Swelling of the lips, face or throat after any essential oil: treat as an emergency.

Stop using the product and contact a clinician or emergency service. In the US, Poison Control is 1-800-222-1222.

General information only, not medical advice. Ask a clinician or pharmacist before use, especially with medicines, in pregnancy or with a health condition. See the Natural Remedy Safety guide.

Frequently asked questions

Is frankincense oil safe to swallow?

No. We do not advise swallowing any essential oil. Poison Control warns that some essential oils are poisonous if swallowed and that breathing oil into the lungs can cause pneumonia. We found no data on swallowed frankincense oil of any species, so no safe amount is known. If someone swallows any essential oil, call poison control (US: 1-800-222-1222) or your emergency number.

²⁷

Are carterii and sacra frankincense different?

Not as plants. In the GBIF database, Boswellia carteri (also spelled carterii) is a synonym of Boswellia sacra. In a 2005 resin study, the two were quite alike. Oils may still differ by where the resin was grown and how it was distilled.

^{32 10}

How does Boswellia frereana differ from the others?

In resin tests it lacked the incensole family of compounds and held many alpha-phellandrene dimers. Lab studies of B. frereana used resin extracts, not essential oil. We found no study of its essential oil in people.

^{10 4 22}

Which frankincense species is best?

No source we read shows that. The human trials do not name their species, and lab comparisons mostly use resin extracts. In one nine-species lab comparison B. sacra extracts were most toxic to breast cancer cells in a dish, which is not a health benefit.

^{23 3 24}

Can frankincense oil cause an allergic reaction?

Yes. A case of allergic contact dermatitis from Boswellia carterii oil has been reported, and another from a Boswellia serrata extract in a cream, though we could read only the titles. Poison Control says to dilute oils in a carrier oil, avoid damaged skin, and stop and wash off if a rash appears.

^{6 1 27}

Is a bottle of carterii frankincense oil really carterii?

Not always. In one analysis of 21 commercial oils sold as B. carteri, several held synthetic additives, castor oil, or another Boswellia species. A different paper found B. occulta oil in bottles sold as pure carteri, including certified organic oil.

^{20 12}

Can a lab test tell the species apart?

Yes, but with care. A 2016 study told four species apart from their scent compounds, and a 2005 study did so for resins of certified origin. A 2026 review says single markers are not enough, and combined methods work better.

^{18 10 15}

Does frankincense oil treat cancer?

No. B. sacra and B. serrata oils killed cancer cells in dishes, and B. sacra oil slowed a tumour in mice. No trial in people was found. Cancer should be treated by a medical team.

^{26 17 2}

Does frankincense oil help with tiredness or back pain?

Evidence is weak. A trial of frankincense oil alone found no effect on tiredness during chemotherapy. Massage with a frankincense and myrrh mix lowered back pain scores in one trial and not in another, and myrrh was always in the mix. No species was named.

^{23 3 21}

Is it safe in pregnancy, for babies, children or pets?

We found no data for any of these oils in pregnancy, breastfeeding, babies, children or pets. Poison Control notes that children have thin skin and immature livers and may be more susceptible. Ask a doctor, midwife, pharmacist or vet, and keep bottles out of reach.

²⁷

Can it interact with medicines?

It is unstudied for the oils. In test tubes, resin extracts of all four species blocked several liver enzymes that process medicines, but those were not oils and no person was tested. Poison Control says essential oils may interact with medications. A pharmacist can check your medicines.

^{9 27}

Are frankincense trees endangered?

Several are under pressure. A 2025 study reports declines in multiple species, and a trade review says demand for Indian frankincense (B. serrata) far exceeds what can be harvested without endangering it. We did not read the exact status of B. sacra, B. carterii or B. frereana.

^{7 5}

Explore by health goal

Cellular Protection Reduce Fatigue Pain Relief Inflammation Balance

Editorial transparency

Written by: AlternativeMed editorial team. Research compiled with AI assistance, then checked against PubMed records.
Medical review: None. This page has not been reviewed by a physician or pharmacist.
First published: 2026-10-25
Last substantive update: 2026-10-25
How we research: We read the abstracts of 24 PubMed papers (two more were seen as titles only) and the Poison Control, NCCIH, NIEHS and FDA pages. We checked the species names in the GBIF plant database and the compounds in PubChem. We did not read a LiverTox, LactMed or EMA statement on frankincense oil.
How we rate evidence: See "How we rate evidence" in the Evidence tab.
Independence: No product is promoted on this page. No affiliate links are shown. One blend trial used a company's product and is labelled.

Sources 32

Each source was opened and checked. Where we read only the abstract, it says so. The small numbers in the text point here.

Acebo E, Raton JA, Sautua S, et al. Allergic contact dermatitis from Boswellia serrata extract in a naturopathic cream.. Contact Dermatitis. 2004. PMID 15373853. DOI 10.1111/j.0105-1873.2004.0396d.x. (title-only)
Alarcon-Aguilar FJ, Torres-Chacon DL, Suarez-Alonso A, et al. Cytotoxic Activity of Boswellia serrata Roxb. Essential Oil and Acetyl-11-Keto-beta-Boswellic Acid (AKBA) on Hepatocellular Carcinoma Cells: In Vitro and In Silico Study.. International Journal of Molecular Sciences. 2026. PMID 42450245. DOI 10.3390/ijms27135978. (abstract)
Alkanat HO, Ozdemir U, Kulakli F. The effects of massage with frankincense and myrrh oil in chronic low back pain: A three-arm randomised controlled trial.. Explore (NY). 2023. PMID 37121835. DOI 10.1016/j.explore.2023.04.004. (abstract)
Blain EJ, Ali AY, Duance VC. Boswellia frereana (frankincense) suppresses cytokine-induced matrix metalloproteinase expression and production of pro-inflammatory molecules in articular cartilage.. Phytotherapy Research. 2010. PMID 19943332. DOI 10.1002/ptr.3055. (abstract)
Brendler T, Brinckmann JA, Schippmann U. Sustainable supply, a foundation for natural product development: The case of Indian frankincense (Boswellia serrata Roxb. ex Colebr.).. Journal of Ethnopharmacology. 2018. PMID 30031142. DOI 10.1016/j.jep.2018.07.017. (abstract)
Buonomo M, Hylwa S. Allergic contact dermatitis from Boswellia carterii (frankincense) oil.. Contact Dermatitis. 2021. PMID 33963563. DOI 10.1111/cod.13881. (title-only)
DeCarlo A, Johnson S, Agieb S, et al. Compositional Analysis of Cultivated and Wild-Harvested Boswellia sacra Frankincense Resin Essential Oils in Oman.. Chemistry and Biodiversity. 2025. PMID 41124237. DOI 10.1002/cbdv.202502268. (abstract)
El-Nashar HAS, Elhawary EA, Nilofar N, et al. Comparative metabolic profiling, enzyme inhibitory activities, and in-silico analysis of the hexane extract and the hydrodistilled oil of Boswellia serrata.. PLoS One. 2026. PMID 42102034. DOI 10.1371/journal.pone.0348178. (abstract)
Frank A, Unger M. Analysis of frankincense from various Boswellia species with inhibitory activity on human drug metabolising cytochrome P450 enzymes using liquid chromatography mass spectrometry after automated on-line extraction.. Journal of Chromatography A. 2006. PMID 16364338. DOI 10.1016/j.chroma.2005.11.116. (abstract)
Hamm S, Bleton J, Connan J, Tchapla A. A chemical investigation by headspace SPME and GC-MS of volatile and semi-volatile terpenes in various olibanum samples.. Phytochemistry. 2005. PMID 15922374. DOI 10.1016/j.phytochem.2005.04.025. (abstract)
Hawkins J, Hires C, Keenan L, Dunne E. Aromatherapy blend of thyme, orange, clove bud, and frankincense boosts energy levels in post-COVID-19 female patients: A randomized, double-blinded, placebo controlled clinical trial.. Complementary Therapies in Medicine. 2022. PMID 35341944. DOI 10.1016/j.ctim.2022.102823. (abstract)
Johnson S, DeCarlo A, Satyal P, et al. Organic Certification is Not Enough: The Case of the Methoxydecane Frankincense.. Plants (Basel). 2019. PMID 30987305. DOI 10.3390/plants8040088. (abstract)
Johnson S, Abdikadir A, Satyal P, et al. Conservation Assessment and Chemistry of Boswellia ogadensis, a Critically Endangered Frankincense Tree.. Plants (Basel). 2022. PMID 36501419. DOI 10.3390/plants11233381. (abstract)
Mikhaeil BR, Maatooq GT, Badria FA, Amer MM. Chemistry and immunomodulatory activity of frankincense oil.. Zeitschrift fur Naturforschung C. 2003. PMID 12710734. DOI 10.1515/znc-2003-3-416. (abstract)
Nastic N, Pastor K. Chemical Profiling and Authentication of Boswellia Species and Frankincense Products: Advances in Metabolomics and Quality Markers.. Plants (Basel). 2026. PMID 42884781. DOI 10.3390/plants15192916. (abstract)
Negussie A, Gebrehiwot K, Yohannes M, et al. Continuous resin tapping for frankincense harvest increases susceptibility of Boswellia papyrifera trees to longhorn beetle damage.. Heliyon. 2021. PMID 33665427. DOI 10.1016/j.heliyon.2021.e06250. (abstract)
Ni X, Suhail MM, Yang Q, et al. Frankincense essential oil prepared from hydrodistillation of Boswellia sacra gum resins induces human pancreatic cancer cell death in cultures and in a xenograft murine model.. BMC Complementary and Alternative Medicine. 2012. PMID 23237355. DOI 10.1186/1472-6882-12-253. (abstract)
Niebler J, Buettner A. Frankincense Revisited, Part I: Comparative Analysis of Volatiles in Commercially Relevant Boswellia Species.. Chemistry and Biodiversity. 2016. PMID 27012219. DOI 10.1002/cbdv.201500329. (abstract)
Obistioiu D, Hulea A, Cocan I, et al. Boswellia Essential Oil: Natural Antioxidant as an Effective Antimicrobial and Anti-Inflammatory Agent.. Antioxidants (Basel). 2023. PMID 37891886. DOI 10.3390/antiox12101807. (abstract)
Ojha PK, Poudel DK, Rokaya A, et al. Comparison of Volatile Constituents Present in Commercial and Lab-Distilled Frankincense (Boswellia carteri) Essential Oils for Authentication.. Plants (Basel). 2022. PMID 36015437. DOI 10.3390/plants11162134. (abstract)
Ozdemir U, Tasci S, Doner A, et al. The effect of back massage with frankincense and myrrh oil before the cardiac electrophysiological procedure on back pain intensity and comfort: A single-blind randomized controlled trial.. Explore (NY). 2024. PMID 37783585. DOI 10.1016/j.explore.2023.09.007. (abstract)
Parr C, Ali AY. Boswellia frereana suppresses HGF-mediated breast cancer cell invasion and migration through inhibition of c-Met signalling.. Journal of Translational Medicine. 2018. PMID 30314527. DOI 10.1186/s12967-018-1660-y. (abstract)
Reis D, Throne T, Keller J, et al. Cancer-Related Fatigue: A Pilot Study Evaluating the Effect of Frankincense Essential Oil in Patients With Cancer Receiving Chemotherapy.. Cancer Nursing. 2023. PMID 35245227. DOI 10.1097/NCC.0000000000001080. (abstract)
Schmiech M, Lang SJ, Werner K, et al. Comparative Analysis of Pentacyclic Triterpenic Acid Compositions in Oleogum Resins of Different Boswellia Species and Their In Vitro Cytotoxicity against Treatment-Resistant Human Breast Cancer Cells.. Molecules. 2019. PMID 31181656. DOI 10.3390/molecules24112153. (abstract)
Stengler E, Huber R, Kowarschik S, Luth VM. Anti-inflammatory properties of Boswellia frereana, Boswellia neglecta, Boswellia rivae, Boswellia sacra, Boswellia serrata, Commiphora confusa, Commiphora kataf and Commiphora myrrha extracts in viral and chronic respiratory inflammation.. Journal of Ethnopharmacology. 2026. PMID 40876795. DOI 10.1016/j.jep.2025.120500. (abstract)
Suhail MM, Wu W, Cao A, et al. Boswellia sacra essential oil induces tumor cell-specific apoptosis and suppresses tumor aggressiveness in cultured human breast cancer cells.. BMC Complementary and Alternative Medicine. 2011. PMID 22171782. DOI 10.1186/1472-6882-11-129. (abstract)
n/a. Poison Control (America's Poison Centers): Essential oils: Poisonous when misused. n/a. . (full-text)
n/a. NCCIH: Aromatherapy. n/a. 2020. (full-text)
n/a. FDA: Aromatherapy. n/a. 2023. (full-text)
n/a. NIEHS: Essential oils. n/a. 2026. (full-text)
n/a. PubChem: alpha-pinene CID 6654; octyl acetate CID 8164; limonene CID 22311; alpha-phellandrene CID 7460; estragole (methylchavicol) CID 8815; methyl eugenol CID 7127; nerolidol CID 5284507; incensole acetate CID 53386731 (PUG REST, read 2026-10-25). n/a. 2026. (full-text)
n/a. GBIF Backbone Taxonomy: Boswellia names (match API, read 2026-10-25). n/a. 2026. (full-text)

Education, not medical advice. This page is for general information. It does not diagnose or treat any condition and is not a substitute for care from a qualified health professional. Natural does not automatically mean safe. Ask a clinician or pharmacist before changing your care, especially if you take medication, are pregnant or breastfeeding, or have a health condition.