Essential Oils & Aromatherapy · Essential oil
Black Pepper Oil
Piper nigrum L. · also called Black pepper essential oil, Piper nigrum fruit oil
Black pepper oil is the strong, spicy oil steam-distilled from the dried berries of the pepper plant. It is used as a scent in diffusers and diluted massage oils. A few small studies of its scent looked at the swallowing reflex in older people with stroke and at cigarette cravings, but the evidence is thin. The main caution: it is an irritant and skin sensitiser, it should not be swallowed or put on skin undiluted, and it should be kept away from children and pets.
General information, not medical advice. Last substantive update · Not medically reviewed. A named clinician has not signed off on this page. How this page is made
About Black Pepper Oil
Black pepper oil is the strong oil distilled from pepper berries. Small studies of its scent looked at the swallowing reflex in older stroke patients and at cravings in smokers, with low-certainty results. Safety comes first: it irritates skin and eyes, can cause allergy, should not be swallowed or used undiluted, and can harm pets and children.
What black pepper oil is
Black pepper oil comes from the dried fruits (berries) of Piper nigrum L., in the pepper family, Piperaceae (GBIF). It is made by steam distillation. In five batches analysed for EFSA, the main parts were beta-caryophyllene (about 25.6%), limonene (about 12.5%), sabinene (about 9.4%) and alpha-pinene (about 8.9%).
Two bottles can differ. A lab study of 23 oils from nine countries found Chinese and Malaysian oils set apart by very low sabinene and high 3-carene, and another study found four chemical groups among oils from different regions.
The oil is not the same as ground pepper. EFSA found piperine, the sharp compound of the spice, at below 0.0005% on average in the oil, against 0.5% to 2.0% in the oleoresin. Results for the spice or for piperine supplements do not carry over to the oil.
What the research found, and how strong it is
Swallowing: in one 105-person trial of post-stroke nursing-home residents, 1 minute of breathing in the oil shortened the swallowing reflex time compared with lavender oil and water. The group also reported brain-flow changes. A 10-child series had mixed results. The evidence is low: one research group, no group sizes in the abstract, and no pneumonia or eating outcomes.
Craving: in a 3-hour session, smokers who puffed black pepper vapour reported less craving than with a mint or empty cartridge. A 20-person campus study found black pepper lowered craving. No trial tested quitting.
Stress, veins and animals: one 20-man experiment found smaller heart-rate changes with the scent but no difference in how stressed the men felt; a 60-patient trial of oil on the skin made veins easier to find with no placebo group; and a mouse study found anxiety-like behaviour fell when the oil was swallowed. These are very low or insufficient evidence.
The research in one view
Almost all the studies are small and short, and the strong smell is hard to hide from a comparison group. The outcomes are mostly body signals or self-rated craving, not pneumonia, quitting or anxiety diagnoses. A 2023 review of herbal smoking treatments said black pepper beat placebo for craving, but its numbers do not fit together, so we do not rely on it. NCCIH says little rigorous research has been done on aromatherapy.
Scent, skin and swallowing are three different things
The trials here are of breathing the scent briefly, or of oil put on skin by nurses. They do not show that bottled oil is safe to swallow or to use undiluted. Poison Control says diluting an essential oil in a carrier oil is the best way to avoid a bad skin reaction. The mouse study gave the oil by mouth; swallowing is not advised.
What authorities say
EFSA's 2022 opinion on black pepper oil as an animal feed flavouring found no concern at very low feed levels and described the oil as an irritant and a sensitiser. The FDA says aromatherapy claims that a product will relieve anxiety or pain make it a drug, and that plant origin does not make a product safe. NCCIH (page last updated January 2020) says aromatherapy oils are breathed in or applied diluted to skin and that little rigorous research has been done. We did not find or read statements from EMA, LiverTox or LactMed on black pepper oil.
At a glance
Traditional uses history, not proof
- Black pepper is described as historically one of the most important spices and herbal medicines (2019 chemistry paper).
- Black pepper oil in aromatherapy is recent: a 2024 paper says it had not yet been used in aromatherapy for stress.
Studied for research
- Swallowing reflex in older stroke patients, scent, low
- Tobacco craving, vapour or scent, low
- Body stress response during a hard task, scent, very low
- Vein visibility before a drip, on the skin, very low
- Anxiety-like behaviour, mouse study only, insufficient
Main compounds
- Beta-caryophyllene, about 25.6% in five batches (EFSA)
- Limonene, about 12.5%
- Sabinene, about 9.4%; alpha-pinene, about 8.9%
- Piperine, below 0.0005% on average (the sharp compound of pepper is scarcely in the oil)
Common forms
- Essential oil (steam-distilled berries)
- Scent from a diffuser, tissue or vapour device (as used in trials)
- Diluted in a carrier oil for massage (dilution figures differ between sources and none is given here)
Research links: Poison Control: Essential oils · FDA: Aromatherapy · NCCIH: Aromatherapy · Pet Poison Helpline: Essential oils · EFSA opinion on black pepper oil (abstract) · Swallowing-reflex trial (abstract) · Research Library · Genes & Biomarkers Library
What it is and its history
- Accepted scientific name
- Piper nigrum
- Naming authority
- L.
- Common names
- Black pepper oil (English); Black pepper essential oil (English); Piper nigrum fruit oil (English)
- Family or group
- Piperaceae (the pepper family), per GBIF.
- Classification
- Plantae > Tracheophyta > Magnoliopsida > Piperales > Piperaceae > Piper > Piper nigrum
- Native range
- EFSA says P. nigrum is not native to Europe. The studies describe oils from Madagascar, the Brazilian Amazon, Sri Lanka and nine producing countries including China and Malaysia. Other range details were not read.
- Habitat
- Not covered by the sources read.
- What it looks like
- Part used: The oil is made from the dried fruits (berries) of the pepper plant by steam distillation or hydrodistillation. This page does not describe how to recognise the plant.
- Cultivation
- Not covered by the sources read.
- Harvest and processing
- Steam distillation of black pepper fruits (EFSA; Wang 2019); hydrodistillation in the Dosoky 2019 study.
- Look-alikes and adulterants
- Name: Other pepper products: oleoresin, supercritical extract, white or green pepper oils, and ground pepper; Note: EFSA treats the oil, the oleoresin and the supercritical extract as three different products; the oleoresin has far more piperine than the oil. Results for one do not carry to the others.
- Sustainability and conservation
- Not checked.
Traditional use and history history, not clinical proof
| Tradition or era | Documented use | Source |
|---|---|---|
| Medicine and spice | A 2019 chemistry paper calls black pepper historically one of the most important spices and herbal medicines, now grown in tropical regions worldwide, and says its fruit oil is a commercially important commodity. Specific traditional medicine uses were not read. | Dosoky 2019 (abstract) |
| Modern aromatherapy research | The 2024 stress experiment says black pepper essential oil had not yet been used in aromatherapy in this context. Japanese teams studied it for swallowing in 2006 and 2008, and a US team tested it as a smoking-craving substitute in 1994. | Dilrukshi 2024; Ebihara 2006; Munakata 2008; Rose 1994 |
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 |
|---|---|---|---|---|
| Beta-caryophyllene PubChem 5281515 | sesquiterpene | Steam-distilled oil from the dried fruit (berries) About 25.6% of the oil by GC peak area (mean of five Sri Lankan batches, range 25.1% to 26.0%) | Not tested in people for this oil. A main part of the oil. 21 5 | Laboratory |
| Limonene PubChem 22311 | monoterpene | Steam-distilled oil from the dried fruit (berries) About 12.5% (range 11.5% to 13.4%) in the same five batches | A known fragrance allergen when it has met air (patch-test work). A main part of the oil. 21 5 1 | Laboratory |
| Sabinene PubChem 18818 | monoterpene | Steam-distilled oil from the dried fruit (berries) About 9.4% (range 9.1% to 9.6%); below 0.2% in some Chinese and Malaysian oils | Marker of the oil's origin in one lab study. 21 5 14 | Laboratory |
| Alpha-pinene PubChem 6654 | monoterpene | Steam-distilled oil from the dried fruit (berries) About 8.9% (range 8.4% to 9.7%) | A main part of the oil; effects not shown here. 21 5 | Laboratory |
| Beta-pinene PubChem 14896 | monoterpene | Steam-distilled oil from the dried fruit (berries) About 7.8% (range 7.6% to 7.9%) | A main part of the oil; effects not shown here. 21 5 | Laboratory |
| 3-Carene (delta-3-carene) PubChem 26049 | monoterpene | Steam-distilled oil from the dried fruit (berries) About 7.3% (range 6.9% to 7.6%); 10.9% to 21.1% in some Chinese and Malaysian oils | Marker of origin in one lab study. 21 5 14 | Laboratory |
| Piperine PubChem 638024 | alkaloid (amide) | Steam-distilled oil from the dried fruit (berries) Below 0.0005% on average in five oil batches (EFSA); 0.5% to 2.0% in the oleoresin | The sharp compound of pepper; it is scarcely in the oil, which is why the oil and ground pepper are different products. 21 5 | Laboratory |
Mechanisms, receptors and pathways
| Target or pathway | Gene or receptor | What was found | Level |
|---|---|---|---|
| Brain activity linked to swallowing | In the 2006 trial brain-flow scans showed more blood flow in the insular and orbitofrontal regions after black pepper oil inhalation, with higher serum substance P. The authors think the smell triggers these areas and the reflex. This is the authors' interpretation from one small trial. 6 7 | Human small | |
| Serotonin 5-HT1A receptor (mouse anxiety tests) | 5-HT1A | In mice, an antagonist of the 5-HT1A receptor reversed the oil's anxiety-like effects, while a GABA-site blocker did not. 10 | Animal research |
| Throat and chest sensation (craving) | The 1994 authors conclude that breathing-tract sensations are important in easing withdrawal; the pepper vapour gave stronger chest sensations than the controls. 13 | Human small |
Absorption, metabolism and elimination
- Absorption
- Not established in the sources read.
- Distribution
- Not established.
- Metabolism
- Not established.
- Elimination
- Not established.
- Bioavailability
- Not established.
Isolated compounds versus whole extracts
Black pepper oil (steam-distilled), oleoresin, supercritical extract, piperine supplements and ground pepper are different products. The oil contains almost no piperine; the oleoresin has far more. Trials of the scent do not show effects of the spice, and the other way round.
Nutritional composition
Black pepper oil is not a food, a nutrient or a supplement to swallow. Ground pepper as a food spice is a different product.
2 low certainty2 very low certainty1 not enough evidence
What is Black Pepper Oil good for?
The uses people ask about and how strong the evidence is for each. Read the certainty label first: these are short scent or vapour studies, not bottled oil swallowed or used undiluted on skin.
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.
Swallowing reflex (smelling the oil)
Low certaintyIn older nursing-home residents who had had a stroke, breathing in black pepper oil for a minute shortened the time to the swallowing reflex in one 105-person trial. A small case series in children had mixed results. The evidence is small and mostly from one research group.
3 studiesStudied as a scent or vapour breathed in for a short time, in set tri…
Studies, doses and limits
What the trials found
A 1-month randomized trial in 105 post-stroke nursing-home residents in Japan (2006), a 10-child case series with no control group (2008), and a 2021 narrative review by authors from the same group.
Results
2006 trial: 1 minute of nasal inhalation shortened the swallowing reflex time compared with lavender oil and distilled water (P < .03); after a month the reflex time was better than before, with higher serum substance P (P < .01); swallowing movements rose during inhalation (P < .001). 2008 series: 5 of 8 children who continued for 3 months ate more by mouth, 3 did not benefit, 2 stopped because of cough or a smell the family could not bear; none came off tube feeding. 2021 review: repeats the improvement and the brain-imaging finding with no numbers.
Effect sizes as reported
No effect sizes in seconds are given in the abstracts; P values only (P < .03 against lavender and water for reflex time).
Why this rating
One randomized trial from one research group, no group sizes or effect sizes in seconds in the abstract, doubtful blinding because the smell is strong, a reflex-time outcome rather than fewer pneumonias, and a 10-child uncontrolled series.
Form and dose studied
Studied as a scent or vapour breathed in for a short time, in set trial settings. No amounts are advised here. Bottled essential oil is concentrated: do not swallow it and do not put it on skin undiluted; ask a pharmacist.
Who was studied
Older post-stroke residents in Japanese nursing homes; children aged about 1.5 to 8 years on tube feeding.
Limits
No trial measured pneumonia, weight, or how well people ate. No independent group has repeated it in the studies we found. Funding for the children's study was not stated.
Why researchers looked
Swallowing problems after a stroke can let food or saliva enter the lungs and cause pneumonia, so researchers looked for ways to trigger the swallowing reflex.
Traditional use
No traditional use for swallowing was found in the sources read.
Proposed mechanism Preliminary mechanism
The authors suggest the smell activates the insular and orbitofrontal parts of the brain, which raised blood flow in scans, and raises blood substance P. That is the authors' idea and was seen in the same small trial.
A proposed mechanism does not show that the effect happens in people.
Two children's families stopped because of cough or an unbearable smell. Swallowing problems need a clinician: smelling an oil is not a substitute for a swallowing assessment.
Tobacco and nicotine craving (breathed-in oil)
Low certaintyIn a 3-hour session, smokers who puffed black pepper oil vapour reported less craving than those using a mint or an empty cartridge. A small campus study and a case report point the same way. None of them tested whether people actually quit.
4 studiesStudied as a scent or vapour breathed in for a short time, in set tri…
Studies, doses and limits
What the trials found
A randomized three-group trial in 48 smokers (1994), a 20-person pre/post comparison on a campus (2013), a one-patient case report of burned pepper (2022), and a 2023 pooled review of many herbs whose abstract has inconsistent numbers.
Results
1994: after overnight abstinence, craving was significantly lower with black pepper vapour than with the mint or empty cartridge; negative mood and anxiety symptoms were lower than with the empty cartridge; chest sensations were stronger. 2013: both black pepper and angelica lowered craving and delayed next tobacco use, black pepper lowered craving more, angelica gave the longer delay. 2022: one patient said burned pepper helped. 2023: the abstract says black pepper and lime beat placebo for craving.
Effect sizes as reported
No effect sizes are given in the abstracts read; the 1994 trial reports a significant fall in craving versus both controls.
Why this rating
Two small studies with self-rated craving, one of 3 hours and one with 20 people and no scent-free control, a strong smell that is hard to hide, and a review abstract with numbers that do not fit.
Form and dose studied
Studied as a scent or vapour breathed in for a short time, in set trial settings. No amounts are advised here. Bottled essential oil is concentrated: do not swallow it and do not put it on skin undiluted; ask a pharmacist.
Who was studied
Adult cigarette smokers and other daily nicotine users; one man in custody.
Limits
No trial showed that people quit smoking or stayed off tobacco. Nothing was tested over weeks or months. The case report is burned pepper spice, and breathing smoke is not safe.
Why researchers looked
Researchers think part of the pull of smoking is the feeling in the throat and chest, so they tested a harmless-looking vapour that gives a similar feeling.
Traditional use
No traditional use for this was found. A 2022 case report describes burned pepper being inhaled in a correctional facility.
Proposed mechanism Preliminary mechanism
The authors of the 1994 trial suggest that the chest and throat sensations from the vapour help ease withdrawal. This is their reading, not proven.
A proposed mechanism does not show that the effect happens in people.
Chest sensations were stronger with the pepper vapour. Do not burn pepper or any material to inhale it. Ask a clinician or quitline about proven quit-smoking help.
Body stress response during a hard task (smelling the oil)
Very low certaintyIn 20 young men doing a hard mental task, black pepper scent was linked with a smaller rise in heart rate and a smaller fall in heart rate variability than a scentless control. The men's own ratings did not differ. It is one short experiment.
1 studiesStudied as a scent or vapour breathed in for a short time, in set tri…
Studies, doses and limits
What the trials found
A within-participant experiment in 20 male university students (2024) with ginger scent and a scentless control as comparisons.
Results
During a 30-minute calculation task the rise in heart rate with black pepper was 38.9% smaller than with the scentless control (p = 0.048) and the fall in heart rate variability was 32.9% smaller (p = 0.002 for multiple comparisons). The rise in skin conductance was 15.5% smaller than with ginger (p = 0.005). Self-rated scores did not differ between the conditions.
Effect sizes as reported
Heart rate rise 38.9% smaller (p = 0.048) and fall in heart rate variability 32.9% smaller (p = 0.002) than with the scentless control; no difference in self-rated stress.
Why this rating
One experiment, 20 young men, body signals that do not show less anxiety, a smell that is hard to hide, one author from a fragrance company, and no difference in what people said they felt.
Form and dose studied
Studied as a scent or vapour breathed in for a short time, in set trial settings. No amounts are advised here. Bottled essential oil is concentrated: do not swallow it and do not put it on skin undiluted; ask a pharmacist.
Who was studied
Healthy male university students in Japan.
Limits
Not tested in women, older people, or people with anxiety. No follow-up. Not a treatment trial.
Why researchers looked
The authors say black pepper oil had not yet been tested in aromatherapy for stress, and wanted to see how its smell changes the body's stress response under controlled conditions.
Traditional use
None found in the sources read.
Proposed mechanism Preliminary mechanism
The authors measured heart and skin signals of the autonomic (automatic) nervous system. The paper shows the signals changed, not why.
A proposed mechanism does not show that the effect happens in people.
A changed heart rate during a task does not show the oil treats anxiety. People sensitive to smells may find strong scents unpleasant.
Vein visibility before a drip (oil on the skin)
Very low certaintyIn one 60-patient trial from Turkey, nurses put black pepper oil on the skin before placing a drip and veins were judged easier to find and the catheter went in faster than in patients given nothing. The control group had no placebo.
1 studiesStudied as oil put on the skin by nurses before a procedure; the conc…
Studies, doses and limits
What the trials found
A randomized controlled trial in 60 patients (30 per group) in an endoscopy unit (2022).
Results
Vein degree improved after the oil (p < 0.001). Time to pick a vein and to place the catheter were shorter in the oil group (p < 0.05). Patient and nurse satisfaction were higher than in the control group (p < 0.05).
Effect sizes as reported
No effect sizes in the abstract; P values only (vein degree p < 0.001; times p < 0.05).
Why this rating
One trial, no placebo or hidden blinding, a control group given nothing, the oil strength not stated, no skin-reaction data in the abstract, and satisfaction scores that expectation can sway.
Form and dose studied
Studied as oil put on the skin by nurses before a procedure; the concentration is not stated in the abstract. This page does not advise putting black pepper oil on skin.
Who was studied
Adult patients in a Turkish endoscopy unit.
Limits
Single trial, short-term. Only the abstract was read.
Why researchers looked
Nurses sometimes struggle to find a vein. The authors note only one earlier study of black pepper oil on veins.
Traditional use
None found in the sources read.
Proposed mechanism Preliminary mechanism
The paper does not explain how it might work, and the abstract says nothing about a mechanism.
A proposed mechanism does not show that the effect happens in people.
Black pepper oil is a known irritant and sensitiser (see Safety). The trial abstract does not say how the skin reacted.
Anxiety-like behaviour (mice only)
Not enough evidenceIn mice, black pepper oil given by mouth lessened anxiety-like and depression-like behaviour in standard tests. Nothing like this has been shown in people.
1 studiesGiven by mouth to mice. Not applicable to people; this page does not …
Studies, doses and limits
What the trials found
None in people. One mouse study (2021).
Results
In mice the effects were dose-dependent after acute and repeated oral doses; no movement problems or signs of toxicity; total cholesterol fell.
Effect sizes as reported
Not applicable: mouse work.
Why this rating
Animal behaviour tests given by mouth; no human data for this effect.
Form and dose studied
Given by mouth to mice. Not applicable to people; this page does not advise swallowing the oil.
Who was studied
Mice.
Limits
Mouse tests do not transfer to people, and the route (swallowed) is the one this page warns against.
Why researchers looked
Researchers wanted to know whether the oil acts on serotonin or GABA systems that anti-anxiety drugs use.
Traditional use
None found.
Proposed mechanism Preliminary mechanism
A blocker of the serotonin 5-HT1A receptor reversed the effect, a GABA-site blocker did not. So serotonin may be involved in mice.
A proposed mechanism does not show that the effect happens in people.
The oil should not be swallowed. Swallowed essential oils can be poisonous.
Connections to the rest of health
How Black Pepper Oil 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
A. Wellness goals
| Connected to | Kind of connection | Evidence status | Context | Studies |
|---|---|---|---|---|
| Digestive Support | Low certainty | Swallowing reflex (smelling the oil): In older nursing-home residents who had had a stroke, breathing in black pepper oil for a minute shortened the time to the swallowing reflex in one 105-person trial. A small case series in children had mixed results. The evidence is small and mostly from one research group. | 6 12 7 | |
| Calm Relaxation | Low certainty | Tobacco and nicotine craving (breathed-in oil): In a 3-hour session, smokers who puffed black pepper oil vapour reported less craving than those using a mint or an empty cartridge. A small campus study and a case report point the same way. None of them tested whether people actually quit. | 13 2 15 11 | |
| Stress Reduction | Very low certainty | Body stress response during a hard task (smelling the oil): In 20 young men doing a hard mental task, black pepper scent was linked with a smaller rise in heart rate and a smaller fall in heart rate variability than a scentless control. The men's own ratings did not differ. It is one short experiment. | 3 | |
| Healthy Circulation | Very low certainty | Vein visibility before a drip (oil on the skin): In one 60-patient trial from Turkey, nurses put black pepper oil on the skin before placing a drip and veins were judged easier to find and the catheter went in faster than in patients given nothing. The control group had no placebo. | 8 | |
| Anxiety Support | Not enough evidence | Anxiety-like behaviour (mice only): In mice, black pepper oil given by mouth lessened anxiety-like and depression-like behaviour in standard tests. Nothing like this has been shown in people. | 10 |
B. Body systems
| Connected to | Kind of connection | Evidence status | Context | Studies |
|---|---|---|---|---|
| Nervous System | Biological association | Low certainty | Studied for: Swallowing reflex (smelling the oil) Studied for: Tobacco and nicotine craving (breathed-in oil) | 6 12 7 13 2 15 11 3 10 |
| Digestive System | Biological association | Low certainty | Studied for: Swallowing reflex (smelling the oil) | 6 12 7 |
| Cardiovascular System | Biological association | Very low certainty | Studied for: Vein visibility before a drip (oil on the skin) | 8 |
| Skin Hair Beauty | Biological association | Very low certainty | Studied for: Vein visibility before a drip (oil on the skin) | 8 |
E. Health conditions
| Connected to | Kind of connection | Evidence status | Context | Studies |
|---|---|---|---|---|
| Contact dermatitis | Adverse effect or risk | Documented risk | EFSA lists skin irritation and sensitisation for the oil; patch-test clinics find reactions to essential oils and to air-formed limonene products. EFSA lists skin irritation and sensitisation for the oil; patch-test clinics find reactions to essential oils. Preparation or compound: Black pepper oil on skin; limonene-rich oils when old |
5 9 1 |
| Essential oil poisoning | Adverse effect or risk | Documented risk | General warning from Poison Control; no case report for black pepper oil found. Preparation or compound: Swallowed essential oils in general |
16 |
| Oropharyngeal dysphagia | Low certainty | One randomized trial of the swallowing reflex time in post-stroke residents; no pneumonia outcome. Preparation or compound: Black pepper oil scent |
6 12 7 | |
| Nicotine withdrawal | Low certainty | Craving score in a 3-hour session and a small campus study; no trial of quitting. Preparation or compound: Black pepper oil vapour or scent |
13 2 15 |
I. Biomarkers
| Connected to | Kind of connection | Evidence status | Context | Studies |
|---|---|---|---|---|
| Swallowing reflex latency | Biological association | Low certainty | Measured in trials: decrease. A lab change is not the same as a health benefit. | 6 7 |
| Self-rated craving for cigarettes or nicotine | Biological association | Low certainty | Measured in trials: decrease. A lab change is not the same as a health benefit. | 13 2 |
| Heart rate and heart rate variability during stress | Biological association | Very low certainty | Measured in trials: mixed. A lab change is not the same as a health benefit. | 3 |
J. Genes, receptors and enzymes
| Connected to | Kind of connection | Evidence status | Context | Studies |
|---|---|---|---|---|
| Serotonin 5-HT1A receptor | Preliminary mechanism | Animal | Suggested by one mouse study of the oil given by mouth. | 10 |
L. Active compounds
| Connected to | Kind of connection | Evidence status | Context | Studies |
|---|---|---|---|---|
| Beta-caryophyllene | Biological association | Laboratory | Not tested in people for this oil. A main part of the oil. Preparation or compound: Steam-distilled oil from the dried fruit (berries) |
21 5 |
| Limonene | Biological association | Laboratory | A known fragrance allergen when it has met air (patch-test work). A main part of the oil. Preparation or compound: Steam-distilled oil from the dried fruit (berries) |
21 5 1 |
| Sabinene | Biological association | Laboratory | Marker of the oil's origin in one lab study. Preparation or compound: Steam-distilled oil from the dried fruit (berries) |
21 5 14 |
| Alpha-pinene | Biological association | Laboratory | A main part of the oil; effects not shown here. Preparation or compound: Steam-distilled oil from the dried fruit (berries) |
21 5 |
| Beta-pinene | Biological association | Laboratory | A main part of the oil; effects not shown here. Preparation or compound: Steam-distilled oil from the dried fruit (berries) |
21 5 |
| 3-Carene (delta-3-carene) | Biological association | Laboratory | Marker of origin in one lab study. Preparation or compound: Steam-distilled oil from the dried fruit (berries) |
21 5 14 |
| Piperine | Biological association | Laboratory | The sharp compound of pepper; it is scarcely in the oil, which is why the oil and ground pepper are different products. Preparation or compound: Steam-distilled oil from the dried fruit (berries) |
21 5 |
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).
Evidence at a glance: what changed in 1 lab markers
Tap a number to show only those markers. Counts are markers, not people.
The evidence
The research centre for Black Pepper Oil. Every record here was checked against PubMed or the publisher's page; we never list a study we have not verified.
Evidence by outcome
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 15 PubMed papers, the EFSA opinion in full text, and the Poison Control, FDA, NCCIH and Pet Poison Helpline pages, and checked the plant name in GBIF and compounds in PubChem. We did not find or read a LiverTox, LactMed, EMA or IFRA statement on black pepper oil.
Study library: every study we checked 21
| Study | Design | People | Product, dose, length | Result |
|---|---|---|---|---|
| Botvid 2026 Ten Years of Patch Testing to Hydroperoxides of Limonene and Linalool: Prevalence, Patterns and Clinical Insights. Contact Dermatitis · PMID 41638887 · DOI |
Registry analysis |
6719 Consecutively patch-tested patients at a Danish hospital, 2014 to 2025 |
Hydroperoxides of limonene and linalool (air-formed forms) n/a n/a n/a · vs n/a |
1.6% reacted to limonene hydroperoxide and 3.1% to linalool hydroperoxide. These form when the fragrance parts meet air and are potent sensitisers. The study did not test black pepper oil; limonene is one of its main parts. Methods, limits and fundingOutcomes: Positive patch-test reactions Limitations: Patients with suspected allergy, not the public. Shows a general risk for limonene-rich oils, nothing specific to black pepper oil. Funding and conflicts: Authors declare no conflicts. Read: abstract |
| Cordell 2013 The effects of aromatherapy on nicotine craving on a U.S. campus: a small comparison study. Journal of Alternative and Complementary Medicine · PMID 23536963 · DOI |
Comparative pre post study |
20 Daily nicotine users (cigarettes, snuff or chewing tobacco) at a rural Texas community college |
Black pepper essential oil or angelica essential oil, breathed in from a tissue essential oil Breathed in from a tissue for 2 minutes when craving (trial method, not advice) Not stated in the abstract · vs The other oil (angelica); no scent-free control |
Both oils lowered craving and delayed the next use of tobacco. Black pepper lowered craving more than angelica; angelica gave a longer delay than black pepper. The abstract gives no numbers. Methods, limits and fundingOutcomes: Self-rated craving (0 to 10) before and after, and minutes until next tobacco use Limitations: Only 20 volunteers, a convenience sample, self-rated craving, no unscented control, and the abstract gives no figures. PubMed labels it a randomized trial but the abstract describes a pre/post comparison. Funding and conflicts: Not stated in the abstract. Read: abstract |
| Dilrukshi 2024 Alleviation of acute stress response by black pepper aroma administration. Journal of Physiological Anthropology · PMID 38167228 · DOI |
Within participant experiment |
20 Male university students doing a 30-minute calculation task as a short-term stressor |
Black pepper aroma delivered by an olfactometer (puffs in the first 20 seconds of each minute), compared with ginger aroma and a scentless control (dipropylene glycol) aroma Set by the olfactometer (not advice) 30 minutes per condition · vs Ginger aroma and scentless control |
During the task, heart rate rose and heart rate variability fell. With black pepper the rise in heart rate was 38.9% smaller than with the scentless control (p = 0.048) and the fall in heart rate variability was 32.9% smaller (p = 0.002 for multiple comparisons). The rise in skin conductance was 15.5% smaller than with ginger (p = 0.005). There was no significant difference in the students' own ratings between the conditions. Methods, limits and fundingOutcomes: Heart rate, heart rate variability, skin conductance, and self-rated stress Limitations: Twenty young men only, one short session, body measurements rather than health outcomes, and the smell is hard to hide. The ratings the students gave did not differ. Funding and conflicts: No competing interests declared. One author is from a fragrance company (Takasago International), which is worth noting. Read: abstract |
| Dosoky 2019 Volatiles of Black Pepper Fruits (Piper nigrum L.). Molecules · PMID 31766491 · DOI |
Laboratory analysis n/a |
11 Five oils from Madagascar and six from the Brazilian Amazon |
Black pepper fruit essential oil made by hydrodistillation, analysed by GC-MS fruit n/a n/a · vs Published oils from other regions |
The main components were alpha-pinene, sabinene, beta-pinene, delta-3-carene, limonene and beta-caryophyllene. Comparing with published oils from many regions, a cluster analysis found four clearly separate groups by relative amounts of the main parts. The abstract gives no percentages. Methods, limits and fundingOutcomes: Chemical composition Limitations: A chemistry study; says nothing about effects in people. Funding and conflicts: No conflict declared. Read: abstract |
| EFSA Panel on Additives and Products or Substances used in Animal Feed (FEEDAP); Bampidis 2022 Safety and efficacy of feed additives prepared from Piper nigrum L.: black pepper oil and black pepper oleoresin for use in all animal species and a supercritical extract for use in dogs and cats (FEFANA asbl). EFSA Journal · PMID 36381117 · DOI |
Regulatory opinion n/a |
Scientific opinion on animal-feed flavouring additives (full text on PubMed Central read) | Black pepper oil (steam-distilled fruit oil), oleoresin and supercritical extract fruit n/a n/a · vs n/a |
EFSA concluded the oil, oleoresin and extract are safe for animals at very low levels mixed into complete feed (the figures are for farm and pet feed and are not a guide to using the oil). No tolerance or toxicology studies of the oil itself were submitted, so safety was judged from its parts. No concerns for consumers or the environment at those feed levels. The additives are irritant to skin and eyes and act as dermal and respiratory sensitisers; the manufacturer's safety data sheet lists aspiration hazard, skin irritation (category 2) and skin sensitisation (category 1). In five batches the oil's main parts were beta-caryophyllene (about 25.6%), limonene (about 12.5%), sabinene (about 9.4%) and alpha-pinene (about 8.9%), and the piperine content was on average below 0.0005%, against 0.5 to 2.0% in the oleoresin. Methods, limits and fundingOutcomes: Safety for animals, consumers, users and the environment; composition Limitations: An animal-feed opinion: its numbers are not human or home-use limits. Hazard wording for users comes from the applicant's safety data sheet, which the panel adopted. Oils from other sources may differ. Funding and conflicts: Independent expert panel opinion on a request by a trade association (FEFANA). Read: full-text |
| Ebihara 2006 A randomized trial of olfactory stimulation using black pepper oil in older people with swallowing dysfunction. Journal of the American Geriatrics Society · PMID 16970649 · DOI |
Randomized controlled trial |
105 Older residents of Japanese nursing homes who had had a stroke and had swallowing problems |
Black pepper oil (Piper nigrum) breathed in through the nose as a vapour essential oil 1 minute of nasal inhalation (trial method, not advice); a 1-month course 1 month · vs Lavender oil and distilled water |
Breathing in black pepper oil for 1 minute shortened the time to the swallowing reflex compared with lavender oil and distilled water (P < .03). After the 1-month course the reflex time was better than before the study, with higher blood substance P (P < .01). The number of swallowing movements in 1 minute rose during inhalation (P < .001). Brain blood flow rose in the insular and right orbitofrontal regions (P < .001). The abstract does not give group sizes or the size of the change in seconds. Methods, limits and fundingOutcomes: Latency of the swallowing reflex, number of swallowing movements in 1 minute, serum substance P, regional cerebral blood flow Limitations: The abstract gives no group sizes and no effect sizes in seconds. A strong smell is hard to hide, so blinding is doubtful. The outcome is a reflex time, not pneumonia or eating. The abstract does not report side effects. Funding and conflicts: PubMed lists non-US government research support. The same research group wrote the 2021 review that cites this trial. Read: abstract |
| Ebihara 2021 Medical aromatherapy in geriatric syndrome. Geriatrics and Gerontology International · PMID 33789361 · DOI |
Narrative review |
Review of aromatherapy for older people (swallowing, breathlessness, thinking, falls) | Volatile black pepper oil (among other oils) essential oil n/a n/a · vs n/a |
The review says smelling black pepper oil improved the swallowing reflex in institution residents, and that brain imaging showed activity in the anterior cingulate and insular regions, which help control appetite and swallowing. The abstract gives no numbers. Methods, limits and fundingOutcomes: Swallowing reflex; brain imaging Limitations: Narrative review, not a systematic one. Two of the four authors ran the 2006 trial, so it is not independent confirmation. Only the abstract was read. Funding and conflicts: Not stated in the abstract. Read: abstract |
| Eren 2022 Effect of topical application of black pepper essential oil on peripheral intravenous catheter insertion: A randomized controlled study. Explore (New York) · PMID 34154965 · DOI |
Randomized controlled trial |
60 Patients attending an endoscopy unit in Turkey, 30 per group |
Black pepper essential oil applied to the skin before a drip (catheter) was placed essential oil Concentration not stated in the abstract Single application before the procedure · vs No extra intervention |
Vein degree improved after the oil (p < 0.001). The time to choose a vein and to place the catheter was shorter in the oil group (p < 0.05), and satisfaction was higher than in the control group (p < 0.05). The abstract does not report skin reactions. Methods, limits and fundingOutcomes: Vein visibility and feel (vein degree), time to find a vein, time to a successful catheter, satisfaction of patients and nurses Limitations: The control group received nothing, so nobody was blinded and expectation could explain part of the satisfaction scores. The abstract does not state the strength of the oil or report skin reactions. It is skin use of the oil, a different thing from breathing the scent. Funding and conflicts: Not stated in the abstract. Read: abstract |
| Geier 2022 Contact sensitization to essential oils: IVDK data of the years 2010-2019. Contact Dermatitis · PMID 35417610 · DOI |
Registry analysis |
10930 Patients seen in German skin clinics and patch tested with 12 essential oils |
Twelve essential oils patch tested n/a n/a n/a · vs n/a |
Of 10 930 patients, 908 (8.3%) reacted to at least one oil. Only six oils caused more than 1% positive reactions: ylang ylang (3.9%), lemongrass (2.6%), jasmine absolute (1.8%), sandalwood (1.8%), clove (1.6%) and neroli (1.1%). Masseurs and cosmeticians were at higher risk. The abstract does not name the other six oils, so we cannot say whether black pepper oil was tested. Methods, limits and fundingOutcomes: Share reacting to essential oils Limitations: Patients already seen for skin problems, not the general public. Black pepper oil is not named in the abstract. Funding and conflicts: Not stated in the abstract. Read: abstract |
| Ghosh 2021 Anxiolytic and antidepressant-like effects of essential oil from the fruits of Piper nigrum Linn. (Black pepper) in mice: involvement of serotonergic but not GABAergic transmission system. Heliyon · PMID 33997409 · DOI |
Animal study mouse |
Mice (elevated plus maze, tail suspension and open field tests) | Black pepper fruit essential oil given by mouth to mice essential oil, fruit Oral (animal dosing, not applicable to people) Acute and repeated treatment · vs Control mice and receptor blockers |
The oil produced dose-dependent anxiolytic-like and antidepressant-like effects in the mouse tests. A drug that blocks the serotonin 5-HT1A receptor reversed the effect, but a GABA-site blocker did not. Brain monoamines were unchanged. The authors saw no movement problems or signs of toxicity, and total cholesterol fell. Methods, limits and fundingOutcomes: Anxiety-like and depression-like behaviour in mice; brain monoamines; toxicity signs Limitations: Mouse behaviour tests given by mouth. They do not show an effect in people, and say nothing about breathing the scent. Funding and conflicts: No conflict declared. Read: abstract |
| Mitra 2023 Role of Herbal Medication in Tobacco Cessation Treatment: A Systematic Review and Meta-analysis. Addiction and Health · PMID 37560083 · DOI |
Systematic review |
762 12 trials of herbal treatments for smoking (762 smokers) of many different herbs |
Many herbal products; black pepper and lime are mentioned for craving mixed n/a n/a · vs Placebo and other treatments |
The abstract says black pepper and lime reduced craving better than placebo, and that there was no clear difference in side effects, though minor side effects occurred with some herbal drugs. Several numbers in the abstract do not fit together (for example a risk ratio of 2.77 shown with a range of 0.37 to 1.13), so we do not use its figures. Methods, limits and fundingOutcomes: Quit rates and craving Limitations: Mixed herbs, mixed designs, internally inconsistent numbers in the abstract, and the black pepper finding is given in one sentence with no detail. Funding and conflicts: Authors declare no conflict. Read: abstract |
| Munakata 2008 Olfactory stimulation using black pepper oil facilitates oral feeding in pediatric patients receiving long-term enteral nutrition. Tohoku Journal of Experimental Medicine · PMID 18441508 · DOI |
Case series |
10 Children aged 19 to 97 months with severe neurological disorders who were fed by tube |
Black pepper oil (Piper nigrum) scent essential oil 1 minute of scenting just before each meal (trial method, not advice) 3 months in 8 children · vs None (no control group) |
Ten children were scented before every meal. Eight continued for 3 months. Five of those eight ate more by mouth, with easier swallowing movements, but none came off tube feeding completely. In three it did not help; the authors say severe brain tissue loss, severe malformation or intractable seizures seemed to reduce the effect. In two cases the scent was stopped because of cough or because the family found the smell unbearable. Methods, limits and fundingOutcomes: Amount eaten by mouth and swallowing movement Limitations: Ten children, no control group, mixed conditions, no blinding. The abstract is not clear on how the two stopped cases overlap with the eight who continued. Funding and conflicts: Not stated in the abstract. Two authors are from the same group as the 2006 trial. Read: abstract |
| Rose 1994 Inhalation of vapor from black pepper extract reduces smoking withdrawal symptoms. Drug and Alcohol Dependence · PMID 8033760 · DOI |
Randomized controlled trial |
48 Cigarette smokers after overnight deprivation, one 3-hour session |
Vapour of black pepper essential oil puffed from a cigarette-substitute device essential oil Puffed and inhaled freely during the session (trial method, not advice) One 3-hour session · vs Mint/menthol cartridge, or an empty (unflavoured) cartridge |
Reported craving fell significantly in the black pepper group compared with both control groups. Negative mood and somatic anxiety symptoms were also lower than with the unflavoured placebo. Chest sensations were stronger with black pepper. The authors conclude that breathing-tract sensations help ease withdrawal. Methods, limits and fundingOutcomes: Craving for cigarettes, negative mood, anxiety symptoms, chest sensations Limitations: One session of 3 hours in 48 people, not an attempt to quit. The pepper vapour has a noticeable sting, so blinding is doubtful. The outcomes are self-rated. The abstract does not report side effects beyond chest sensation. Funding and conflicts: PubMed lists US government (non-PHS) research support. Read: abstract |
| Wang 2019 Piper nigrum Oil - Determination of Selected Terpenes for Quality Evaluation. Planta Medica · PMID 30440078 · DOI |
Laboratory analysis n/a |
23 23 steam-distilled black pepper oils from nine producing countries |
Black pepper seed (fruit) oil, steam distilled, analysed by GC/MS and chiral GC/MS fruit n/a n/a · vs n/a |
Principal component analysis separated samples from China and Malaysia: low sabinene (below 0.2%) and high 3-carene (10.9% to 21.1%) compared with other countries. For beta-pinene, sabinene, limonene and terpinen-4-ol, the left-handed forms dominated, with steady ratios (92.2% beta-pinene, 94.8% sabinene, 60.7% limonene, 78.3% terpinen-4-ol) whatever the country, which the authors propose as a signature of authenticity and quality. Methods, limits and fundingOutcomes: Chemical profile and markers for quality Limitations: A chemistry paper. One author is from a spice company (McCormick); no conflict declared. Funding and conflicts: Authors declare no conflicts of interest. Read: abstract |
| Weleff 2022 Black Pepper (Piper nigrum) for Tobacco Withdrawal: A Case Report. Case Reports in Psychiatry · PMID 36530582 · DOI |
Case report |
1 One man who was in a correctional facility without access to cigarettes |
Burned (combusted) black pepper spice, inhaled ground pepper, burned n/a n/a · vs None |
The patient said breathing burned black pepper eased his tobacco withdrawal and cravings. The authors say burned pepper is unlikely to be appealing outside a correctional setting, and suggest vaporized black pepper essential oil may be worth studying. Methods, limits and fundingOutcomes: Patient's account of tobacco withdrawal and cravings Limitations: One person's account. It is burned pepper spice, not the oil. It cannot show that anything works, and breathing smoke is not safe. Funding and conflicts: One author reports stock options from a company for advisory work; the abstract's statement says no other conflicts. Read: abstract |
| n/a Poison Control (National Capital Poison Center, US): Essential oils: Poisonous when misused (page read 2026-10-25; page undated) n/a · Source |
Authoritative guidance n/a |
n/a | n/a n/a n/a n/a · vs n/a |
Misuse of essential oils can cause serious poisoning. Many can cause rashes on skin and some are poisonous if absorbed or swallowed. Aspirating (breathing into the lungs) an essential oil can cause pneumonia. Children have thin skin and immature livers and may be more susceptible. Essential oils may interact with medicines. Pure oils are potent: diluting in a carrier oil is the best way to avoid a bad reaction on skin; not all oils suit skin, and oils should not go on damaged skin. Allergy to an essential oil is a very real possibility; the most common reaction is a rash. It can be hard to know the species, strength or contaminants in a bottle. Bottles must be locked away from children and pets. If someone swallows an essential oil, call the poison center at 1-800-222-1222. Methods, limits and fundingOutcomes: Safety and uses Limitations: A general page about essential oils; black pepper oil is not named on it. Read: full-text |
| n/a Pet Poison Helpline (US): Essential Oils (page read 2026-10-25) n/a · Source |
Authoritative guidance n/a |
n/a | n/a n/a n/a n/a · vs n/a |
Essential oil poisoning can affect all species but cats and birds are at the greatest risk. Common signs are drooling, vomiting, lethargy, loss of appetite, and irritation of the airways, skin and mouth; signs usually start within 6 to 8 hours and severe cases can take 3 to 7 days to resolve. Swallowing is the highest risk, then skin, then breathing. High concentrations are much more concerning than low ones. Do not induce vomiting because of aspiration risk. Its list of oils that commonly cause poisoning does not name black pepper; the page does not say oils off the list are safe. Pet Poison Helpline in North America: 800-213-6680. Methods, limits and fundingOutcomes: Safety and uses Limitations: A general vet-student article; no black pepper oil data. Read: full-text |
| n/a 2020 National Center for Complementary and Integrative Health (NCCIH, US): Aromatherapy (page read 2026-10-25; last updated January 2020) 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 essential oils, most often by breathing them in or by applying a diluted form to the skin. NCCIH says little rigorous research has been done, for example on insomnia, so it is not known whether it helps. It lists many oils; black pepper is not among them. Methods, limits and fundingOutcomes: Safety and uses Limitations: A short general page. Read: full-text |
| n/a 2023 US Food and Drug Administration: Aromatherapy (page read 2026-10-25; content current as of 09/08/2023) n/a · Source |
Regulatory n/a |
n/a | n/a n/a n/a n/a · vs n/a |
How an aromatherapy product is regulated depends on how it is intended and marketed. Claims to treat disease or relieve anxiety, pain or sleep problems are drug claims. Plant origin does not make a product safe: many plants contain materials that are toxic, irritating or likely to cause allergic reactions on skin, and some citrus oils are harmful on sun-exposed skin. Methods, limits and fundingOutcomes: Safety and uses Limitations: General guidance; black pepper oil is not named. Read: full-text |
| n/a 2026 GBIF Backbone Taxonomy: Piper nigrum L. (match API read 2026-10-25) n/a · Source |
Database record n/a |
n/a | n/a n/a n/a n/a · vs n/a |
Species key 3086357: accepted name Piper nigrum L., exact match, family Piperaceae, order Piperales, kingdom Plantae. Methods, limits and fundingOutcomes: Accepted name and family Limitations: Taxonomy only; synonyms were not read. Read: full-text |
| n/a 2026 PubChem: compound records for the main parts of the oil (API read 2026-10-25) n/a · Source |
Database record n/a |
n/a | n/a n/a n/a n/a · vs n/a |
CID 5281515 beta-caryophyllene (C15H24); CID 22311 limonene (C10H16); CID 18818 sabinene (C10H16); CID 6654 alpha-pinene (C10H16); CID 14896 beta-pinene (C10H16); CID 26049 3-carene (C10H16); CID 638024 piperine (C17H19NO3). Methods, limits and fundingOutcomes: Compound identity Limitations: Identifiers and formulas only. Read: full-text |
What we do not know yet
- What the evidence supports: low for swallowing reflex and cravings, very low for stress and veins, insufficient for anxiety (mice only).
- No independent repeat of the swallowing trial, and no trial of pneumonia or eating.
- No trial of black pepper oil for quitting tobacco over weeks or months.
- No oil-specific dilution figure, pregnancy, breastfeeding, asthma, epilepsy or sun-sensitivity statement was found.
- No patch-test rate, pet case report, poisoning report or LiverTox record for black pepper oil was found.
- Piperine-interaction studies were not read; the oil has very little piperine, but that is not an interaction study.
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 3
Swallowing reflex latency
Decrease in trials
The time between a small stimulus in the throat and the swallow reflex. A shorter time is better.
Low certaintyResults and what it means
Why it was measured
A slow reflex is a risk factor for food or saliva entering the lungs.
Statistical vs. clinical meaning
A bedside test result, not a count of pneumonias or a measure of eating.
Safety implication
A faster reflex time in a test does not make swallowing safe. Swallowing problems need a clinician.
| Study | Result | People | Product |
|---|---|---|---|
| 6 | 1 minute of black pepper oil inhalation shortened the reflex time compared with lavender oil and distilled water (P < .03); a 1-month course improved it compared with before the study (P < .01). No seconds are given in the abstract. |
Self-rated craving for cigarettes or nicotine
Decrease in trials
How strongly a person says they want tobacco, usually on a 0 to 10 scale.
Low certaintyResults and what it means
Why it was measured
Craving is a main reason people go back to smoking.
Statistical vs. clinical meaning
A self-report that people can sense is influenced by expectation.
Safety implication
A lower craving score does not show that a person quit.
| Study | Result | People | Product |
|---|---|---|---|
| 13 | Reported craving was significantly lower with black pepper vapour than with the mint and empty-cartridge controls in a 3-hour session. | ||
| 2 | Craving fell with black pepper oil and with angelica oil; black pepper lowered it more, angelica gave a longer wait before the next use. No numbers in the abstract. |
Heart rate and heart rate variability during stress
Mixed results in trials
Heart rate is beats per minute. Heart rate variability is how much the gap between beats varies; it usually falls under stress.
Very low certaintyResults and what it means
Why it was measured
A way to see the body's automatic response to a stressful task.
Statistical vs. clinical meaning
A body signal in healthy young men during a lab task, not a disease marker.
Safety implication
A smaller heart rate rise does not show less anxiety or that the oil is safe for anyone.
| Study | Result | People | Product |
|---|---|---|---|
| 3 | The rise in heart rate was 38.9% smaller and the fall in heart rate variability was 32.9% smaller with black pepper aroma than with a scentless control; self-rated stress did not differ. |
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 4
- Do not swallow black pepper oil. Essential oils can poison, and inhaling them into the lungs can cause pneumonia.. Poison Control says swallowing some essential oils can be poisonous, and that breathing an oil into the lungs while swallowing (aspiration) can cause pneumonia. The manufacturer's safety data sheet for black pepper oil, cited by EFSA, lists an aspiration hazard. We found no poisoning report for black pepper oil itself in the sources we read, and that is not proof that it is safe. Keep bottles locked away from children and pets. If anyone swallows it, call poison help (US: 1-800-222-1222) or your local emergency number. Authoritative guidance 16 5
- Black pepper oil is an irritant and a skin sensitiser. Do not use it undiluted on skin.. EFSA's 2022 opinion says the oil should be considered irritant to skin and eyes and a dermal and respiratory sensitiser; the safety data sheet lists skin irritation (category 2) and skin sensitisation (category 1). Poison Control says diluting an essential oil in a carrier oil is the best way to avoid a bad skin reaction, and that essential oils should not go on damaged skin. We could not read an oil-specific dilution figure from an authority, so none is given here. Regulatory 5 16
- Pets: cats and birds are at the greatest risk from essential oils.. Pet Poison Helpline says essential oil poisoning can affect all species, with cats and birds at greatest risk, and that swallowing is the highest-risk route. Black pepper is not on its list of oils that commonly cause poisoning, which does not mean it is safe. Keep the oil and any diffuser out of reach of pets. Authoritative guidance 17
- Breathing the oil can sting and sensitise the airways; swallowing-reflex use in children led to cough in some.. EFSA calls the oil a respiratory sensitiser. In the 1994 smoking trial, chest sensations were stronger with the pepper vapour, and in the 2008 children's report the scent was stopped in two cases because of cough or because the family found the smell unbearable. No source we read describes asthma or seizure risk for this oil; that is not proof of none. Regulatory 5 13 12
Side effects 5
| Effect | How often | Severity and recovery | Evidence |
|---|---|---|---|
| Skin irritation or redness EFSA lists skin irritation (category 2) on the manufacturer's safety data sheet. Poison Control says to stop using a product that causes a rash and wash it off gently. | Not established | mild to moderate Not described in the sources read | Regulatory 5 16 |
| Skin allergy (sensitisation) EFSA lists skin sensitisation (category 1). The German patch-test study found 8.3% of 10 930 dermatitis patients reacted to at least one of 12 oils; black pepper oil is not named in the abstract, so its own rate is unknown. | Not established | variable Not described in the sources read | Regulatory 5 9 16 |
| Eye irritation EFSA says the oil is irritant to eyes. Keep it away from eyes. | Not established | not described Not described | Regulatory 5 |
| Airway sensitisation or irritation when breathed in EFSA calls the oil a respiratory sensitiser. Stronger chest sensations were reported in the 1994 vapour trial, and cough led to one or two children being taken off the scent in the 2008 report. | Not established | not described Not described | Regulatory 5 13 12 |
| Pneumonia if oil gets into the lungs when swallowed Poison Control describes this for essential oils in general; the black pepper oil safety data sheet lists an aspiration hazard. | Not established | serious Not described | Authoritative guidance 16 5 |
Liver
We found no report of liver injury from black pepper oil in the sources read. LiverTox was not read, so this is not a clean bill of health. Pet Poison Helpline mentions that some essential oils can need liver support in severe pet cases, without naming black pepper oil. 17
How often. Not established.
Monitoring. Not applicable.
This is a safety connection. It is not evidence that Black Pepper Oil supports liver health.
Medicines and supplements 3
| With | Why it matters | Importance | Evidence | What to do |
|---|---|---|---|---|
| Prescription and over-the-counter medicines, in general medicines-general | Poison Control says essential oils may interact with medications. It names no medicine and does not mention black pepper oil. | No black pepper oil interaction was found in the sources read. Absence from these sources is not proof of none. | Authoritative guidance Not enough evidence 16 | Ask a pharmacist or doctor if you take regular medicines, especially before using oil on large areas of skin. |
| Medicines affected by piperine (the sharp compound in pepper) piperine-medicine-interactions | Piperine is the best known pepper compound in medicine-interaction discussions. EFSA measured piperine in five batches of black pepper oil at an average below 0.0005%, against 0.5 to 2.0% in the oleoresin. Studies of piperine interactions were not read for this page, so we cannot say what that means in the body. | The oil is a different product from ground pepper or piperine extract, and piperine-interaction findings for those do not carry over to the oil. No interaction was found for the oil itself. | Regulatory Not enough evidence 5 | Ask a pharmacist about any pepper product alongside medicines. The oil, ground pepper and piperine supplements are different things. |
| Other skin products containing limonene or other fragrance allergens other-oils-and-skin-products | Limonene is a main part of black pepper oil (about 12.5% in five batches). Patch-test clinics find that limonene and linalool turn into potent sensitisers when they meet air, and reactions to them often occur together with other fragrance allergens. | The patch-test study did not test black pepper oil. It shows a general risk with limonene-rich oils that are old or air-exposed. | Registry or database Low certainty 1 5 | Stop any product that causes a rash. Ask a pharmacist or dermatologist about patch testing. |
Who should check first 4
| Situation | Advice | Evidence |
|---|---|---|
| Swallowing the oil or any product not made to be swallowed | Do not swallow. If a child or pet may have swallowed any, call poison control (US: 1-800-222-1222), a vet or Pet Poison Helpline (800-213-6680), or your emergency number. | Authoritative guidance 16 17 |
| Putting the oil on skin undiluted, on damaged skin, or near the eyes | Do not. Poison Control says to dilute in a carrier oil and not to use essential oils on damaged skin. EFSA says the oil irritates skin and eyes. | Regulatory 16 5 |
| A known allergy to essential oils or fragrance, or a past rash from a pepper oil | Avoid. Ask a doctor about patch testing. | Authoritative guidance 16 5 |
| Swallowing problems after a stroke, or any swallowing difficulty | See a clinician. A scent trial in a care home is not a swallowing treatment you can do alone. | Clinical trial 6 |
Overdose, product quality and regulators
Summary. No poisoning report or lethal amount for black pepper oil was found in the sources read. EFSA found no tolerance or toxicology studies of the oil itself and judged safety from its parts, for animal feed only.
Amounts. No safe or toxic amount for people is established here and none is given.
Onset and course. Not described for this oil. For essential oils in pets, Pet Poison Helpline says signs usually begin within 6 to 8 hours and severe cases can take 3 to 7 days to resolve.
Repeated use. Not described.
Animal data. A 2021 mouse study gave the oil by mouth and saw no movement problems or signs of toxicity. EFSA set very low safe levels for the oil mixed into animal feed; those figures are not guidance for pets or people.
Toxic parts. The concentrated oil is hazardous (irritant, sensitiser, aspiration hazard); the main parts are beta-caryophyllene, limonene, sabinene and alpha-pinene.
Not read. LiverTox, poison-centre statistics for this oil, IFRA and the Tisserand Institute were not read.
Essential oils are not tightly regulated, so a bottle can differ from its label, and black pepper oil differs by country of origin.
Unknown species, strength and contaminants. Poison Control says it can be hard to know the species, strength or contaminants in an essential oil bottle. 16
Oils from different countries differ. A lab study of 23 steam-distilled oils from nine countries found China and Malaysia samples set apart (low sabinene below 0.2% and high 3-carene 10.9% to 21.1%). Another lab study found four clusters among oils from Madagascar, Brazil and published data. 14 4
Ways to check authenticity. The 23-oil study suggests the left-right shape (chirality) of certain terpenes could serve as a signature for authenticity; this is a lab method, not something a buyer can check. 14
Air-formed allergens from limonene. Limonene is a main part of the oil and turns into potent sensitisers on air exposure in patch-test work. No source on oxidised black pepper oil was found. 1 5
| Body | Action | Date |
|---|---|---|
| European Food Safety Authority (EFSA), FEEDAP Panel (European Union) | 2022 opinion on black pepper oil, oleoresin and supercritical extract as animal feed flavourings: safe at very low feed levels; no concern for consumers or the environment at those levels; the additives are irritant to skin and eyes and act as dermal and respiratory sensitisers. source | 2022-11-08 |
| US Food and Drug Administration (FDA) (United States) | Aromatherapy products are cosmetic or drug depending on intended use; therapeutic or anxiety claims make them drugs; a plant source does not make a product safe. source | 2023-09-08 |
| National Center for Complementary and Integrative Health (NCCIH) (United States) | Aromatherapy oils are breathed in or applied diluted to skin; little rigorous research has been done. source | 2020-01 |
When to get medical help
- If anyone may have swallowed black pepper oil, call poison control straight away (US: Poison Help 1-800-222-1222) or your local emergency number, especially a child.
- Coughing, choking or trouble breathing after swallowing or breathing in the oil, or face or lip swelling after skin contact, is an emergency: call your local emergency number.
- A spreading rash, blisters or burning after skin contact: stop using it, gently wash it off with soap and water, and see a clinician if it does not settle.
- If a pet may have swallowed or been covered in the oil, call a vet or Pet Poison Helpline (North America 800-213-6680). Do not make the pet vomit.
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 black pepper oil safe to swallow?
No. Poison Control says swallowing some essential oils can be poisonous and that oil entering the lungs can cause pneumonia. The maker's safety data sheet lists an aspiration hazard for black pepper oil. We found no poisoning report for this oil, but that is not proof of safety. If anyone swallows it, call poison help (US: 1-800-222-1222) or your emergency number.
Can I put black pepper oil on my skin undiluted?
Not advised. EFSA says the oil should be considered an irritant to skin and eyes and a skin sensitiser. Poison Control says diluting an essential oil in a carrier oil is the best way to avoid a bad reaction, and not to use essential oils on damaged skin. We found no oil-specific dilution figure from an authority, so none is given here.
Can black pepper oil cause an allergy?
It can: EFSA lists skin sensitisation for it, and Poison Control says allergy to an essential oil is a very real possibility, most often a rash. A German patch-test study found 8.3% of dermatitis patients reacted to at least one of 12 oils; its abstract does not say whether black pepper oil was one. Old, air-exposed oil may be worse because limonene forms sensitisers. Stop and wash off if a rash appears.
Is black pepper oil safe for cats, dogs or birds?
Not shown. Pet Poison Helpline says essential oil poisoning can affect all species, with cats and birds at greatest risk, and swallowing is the highest-risk route. Black pepper is not on its list of oils that commonly cause poisoning, but the page does not say unlisted oils are safe. Keep oils and diffusers away from pets and ask a vet.
Is it safe for babies and children?
No safety trial in healthy children was found. Poison Control says children have thin skin and immature livers and may be more susceptible to toxic effects, and bottles should be locked away. In a 2008 report from a clinic, two of ten tube-fed children were taken off the scent because of cough or because the family found the smell unbearable.
Is black pepper oil safe in pregnancy or while breastfeeding?
Does smelling black pepper oil help older people swallow?
A little, in one trial. In 105 older post-stroke nursing-home residents, 1 minute of inhaling the oil shortened the swallowing reflex time compared with lavender oil and water. It was one research group, the abstract gives no group sizes, and no one counted pneumonias. Certainty is low. Swallowing problems need a clinician.
Does black pepper oil help with cigarette cravings or quitting?
Cravings, a little, in small studies. In a 3-hour session in 48 smokers, black pepper vapour cut reported craving more than a mint or empty cartridge, and a 20-person campus study agreed. No trial shows anyone quit or stayed off tobacco. A case report of burned pepper is not evidence, and breathing smoke is not safe.
Does black pepper oil reduce stress?
One small experiment hints at it. In 20 young men doing a hard task, black pepper scent was linked with a smaller rise in heart rate, but their own stress ratings did not differ. That is a body signal, not proof that it treats anxiety. One author works for a fragrance company.
Is black pepper oil the same as the pepper in my kitchen, or piperine?
No. The oil is distilled from the berries and holds almost no piperine: EFSA found less than 0.0005% on average in five batches, against 0.5% to 2.0% in the oleoresin. Findings for ground pepper or piperine supplements, including medicine interactions, do not carry over to the oil. Ask a pharmacist about any pepper product alongside medicines.
What is in black pepper oil, and do all bottles match?
In five batches the main parts were beta-caryophyllene, limonene, sabinene and alpha-pinene. Oils from different countries differ: Chinese and Malaysian oils stood out for low sabinene and high 3-carene. Poison Control says it can be hard to know the species, strength or contaminants in an essential oil bottle.
Does black pepper oil help veins, pain, infections or cancer?
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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 15 PubMed papers, the EFSA opinion in full text, and the Poison Control, FDA, NCCIH and Pet Poison Helpline pages, and checked the plant name in GBIF and compounds in PubChem. We did not find or read a LiverTox, LactMed, EMA or IFRA statement on black pepper 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.
Sources 21
Each source was opened and checked. Where we read only the abstract, it says so. The small numbers in the text point here.
- Botvid S, Sogaard R, Schwensen JFB, Johansen JD. Ten Years of Patch Testing to Hydroperoxides of Limonene and Linalool: Prevalence, Patterns and Clinical Insights.. Contact Dermatitis. 2026. PMID 41638887. DOI 10.1111/cod.70102. (abstract)
- Cordell B, Buckle J. The effects of aromatherapy on nicotine craving on a U.S. campus: a small comparison study.. Journal of Alternative and Complementary Medicine. 2013. PMID 23536963. DOI 10.1089/acm.2012.0537. (abstract)
- Dilrukshi EAC, Nishiyama Y, Ito K, Nomura S. Alleviation of acute stress response by black pepper aroma administration.. Journal of Physiological Anthropology. 2024. PMID 38167228. DOI 10.1186/s40101-023-00352-1. (abstract)
- Dosoky NS, Satyal P, Barata LM, da Silva JKR, Setzer WN. Volatiles of Black Pepper Fruits (Piper nigrum L.).. Molecules. 2019. PMID 31766491. DOI 10.3390/molecules24234244. (abstract)
- EFSA Panel on Additives and Products or Substances used in Animal Feed (FEEDAP); Bampidis V, et al. Safety and efficacy of feed additives prepared from Piper nigrum L.: black pepper oil and black pepper oleoresin for use in all animal species and a supercritical extract for use in dogs and cats (FEFANA asbl).. EFSA Journal. 2022. PMID 36381117. DOI 10.2903/j.efsa.2022.7599. (full-text)
- Ebihara T, Ebihara S, Maruyama M, et al. A randomized trial of olfactory stimulation using black pepper oil in older people with swallowing dysfunction.. Journal of the American Geriatrics Society. 2006. PMID 16970649. DOI 10.1111/j.1532-5415.2006.00840.x. (abstract)
- Ebihara T, Yamasaki M, Kozaki K, Ebihara S. Medical aromatherapy in geriatric syndrome.. Geriatrics and Gerontology International. 2021. PMID 33789361. DOI 10.1111/ggi.14157. (abstract)
- Eren H, Turkmen AS, Aslan A. Effect of topical application of black pepper essential oil on peripheral intravenous catheter insertion: A randomized controlled study.. Explore (New York). 2022. PMID 34154965. DOI 10.1016/j.explore.2021.06.001. (abstract)
- Geier J, Schubert S, Reich K, et al. Contact sensitization to essential oils: IVDK data of the years 2010-2019.. Contact Dermatitis. 2022. PMID 35417610. DOI 10.1111/cod.14126. (abstract)
- Ghosh S, Kumar A, Sachan N, Chandra P. Anxiolytic and antidepressant-like effects of essential oil from the fruits of Piper nigrum Linn. (Black pepper) in mice: involvement of serotonergic but not GABAergic transmission system.. Heliyon. 2021. PMID 33997409. DOI 10.1016/j.heliyon.2021.e06884. (abstract)
- Mitra R, Rai A, Kumar A, Mitra JK. Role of Herbal Medication in Tobacco Cessation Treatment: A Systematic Review and Meta-analysis.. Addiction and Health. 2023. PMID 37560083. DOI 10.34172/ahj.2023.1290. (abstract)
- Munakata M, Kobayashi K, Niisato-Nezu J, et al. Olfactory stimulation using black pepper oil facilitates oral feeding in pediatric patients receiving long-term enteral nutrition.. Tohoku Journal of Experimental Medicine. 2008. PMID 18441508. DOI 10.1620/tjem.214.327. (abstract)
- Rose JE, Behm FM. Inhalation of vapor from black pepper extract reduces smoking withdrawal symptoms.. Drug and Alcohol Dependence. 1994. PMID 8033760. DOI 10.1016/0376-8716(94)90160-0. (abstract)
- Wang M, Chittiboyina AG, Parcher JF, et al. Piper nigrum Oil - Determination of Selected Terpenes for Quality Evaluation.. Planta Medica. 2019. PMID 30440078. DOI 10.1055/a-0782-0548. (abstract)
- Weleff J, Dore S, Anand A, Barnett BS. Black Pepper (Piper nigrum) for Tobacco Withdrawal: A Case Report.. Case Reports in Psychiatry. 2022. PMID 36530582. DOI 10.1155/2022/5908769. (abstract)
- n/a. Poison Control (National Capital Poison Center, US): Essential oils: Poisonous when misused (page read 2026-10-25; page undated). n/a. . (full-text)
- n/a. Pet Poison Helpline (US): Essential Oils (page read 2026-10-25). n/a. . (full-text)
- n/a. National Center for Complementary and Integrative Health (NCCIH, US): Aromatherapy (page read 2026-10-25; last updated January 2020). n/a. 2020. (full-text)
- n/a. US Food and Drug Administration: Aromatherapy (page read 2026-10-25; content current as of 09/08/2023). n/a. 2023. (full-text)
- n/a. GBIF Backbone Taxonomy: Piper nigrum L. (match API read 2026-10-25). n/a. 2026. (full-text)
- n/a. PubChem: compound records for the main parts of the oil (API read 2026-10-25). n/a. 2026. (full-text)