Grapefruit Oil: Evidence, Safety and How It Is Used
Grapefruit essential oil: the grapefruit-and-medicine question explained, sun and skin cautions, and what small scent trials found for PMS symptoms and procedure discomfort.
Content last updated . This page has not been medically reviewed.
Safety first. Supplements can cause side effects and interact with medicines. Read mushroom safety and interactions before you use any mushroom product.
Safety first. Do not swallow essential oils or add them to drinks. If anyone has swallowed any essential oil, call Poison Help at 1-800-222-1222; call 911 for collapse, a seizure or trouble breathing. [1] The FDA also notes that certain citrus oils used safely in food can be harmful in cosmetics, particularly on skin exposed to the sun. [2] See Phototoxicity: citrus oils and sunlight.
What grapefruit oil is
Grapefruit oil is an essential oil from the grapefruit. GBIF (the Global Biodiversity Information Facility) lists Citrus × paradisi Macfad. as a synonym of Citrus × aurantium L., although many labels and papers still use Citrus paradisi. [3] This page covers the oil only. Grapefruit fruit and juice are a different matter.Grapefruit and medicines: fruit versus oil
The well-known warning is about grapefruit juice and the fruit. The FDA says grapefruit juice and grapefruit can affect the way medicines work, and that it has required warnings on some drugs generally taken by mouth. [4] It explains that grapefruit juice can block an enzyme called CYP3A4 in the small intestine, so more of some drugs enters the blood. [4] Examples the FDA lists include some cholesterol-lowering statins, some blood pressure medicines and some organ-transplant drugs. [4] For the full explanation see Grapefruit and medicine interactions.Does that warning apply to grapefruit oil used for scent or on skin? Proper evidence not found in the sources we read. We searched the FDA consumer update, NCCIH, Poison Control and PubMed records for grapefruit essential oil with interactions and furanocoumarins, and none stated that the oil, inhaled or on skin, has the same effect. Not found is not proof of safety. If you take any medicine on the FDA's warning lists, ask a pharmacist or prescriber about all grapefruit-related products before using the oil. Never stop or change a prescribed medicine on your own.
Sun and skin
Pressed citrus oils such as lemon and bergamot are documented as phototoxic in laboratory and clinical reports; see Lemon oil. Whether grapefruit oil specifically is phototoxic: Proper evidence not found in the sources we read (we searched PubMed for "grapefruit oil phototoxicity" and read the FDA aromatherapy page, which refers only to "certain citrus oils"). [2] Until a source says otherwise, treat it like other citrus oils on skin exposed to sun.Citrus oils also contain fragrance ingredients such as limonene that react with air. Poison Control says allergy to an essential oil is a very real possibility. [1] Stop using a product that causes a rash and gently wash it off. [1] See Patch testing and what to do after a reaction.
What research shows
All findings below concern scent in small trials, with self-reported outcomes; people can smell what they receive, so blinding is hard.| Question | What the source found | Strength of evidence | Population and form studied |
|---|---|---|---|
| Premenstrual syndrome symptoms | In a randomized trial of 90 women, those smelling grapefruit oil had lower total premenstrual syndrome scores than placebo, and lower menstrual pain symptom sub-scores. [5] | Promising but limited | Women with PMS; inhaled for 30 minutes at a time over 3 cycles |
| Discomfort during colonoscopy | In a randomized study of 361 patients, abdominal discomfort was lower in the grapefruit group among those who reported strong anxiety; anxiety was reported as significantly lower in the Osmanthus fragrans group. [6] | Promising but limited | Patients having colonoscopy; vapor diffusion |
| Treatment of diseases, weight loss, metabolism | Proper evidence not found. We searched PubMed for grapefruit oil trials and found none supporting these claims. | No good evidence | Not applicable |
These are single trials. A result in one trial of one oil for one symptom does not show the oil treats anything.
Safety by group
- Pregnancy and breastfeeding, babies and children: The sources we read give no grapefruit-oil-specific advice. Poison Control says children have thin skin and immature livers, which might make them more susceptible to toxic effects than adults. [1] See Essential oils in pregnancy and breastfeeding and around babies and children.
- Medicines: besides grapefruit, Poison Control says essential oils may also interact with medications. [1] See How interactions work.
- Swallowing: Poison Control warns that aspiration (swallowed oil entering the lungs) can cause pneumonia. [1]
- Surgery: tell the surgical team about any oils or supplements; see Before surgery.
Frequently asked questions
Does grapefruit oil interact with medicines like grapefruit juice does?
Proper evidence not found. The FDA warning describes the juice and fruit. [4] Ask a pharmacist.
Is grapefruit oil phototoxic?
Not established in the sources we read for this oil, but the FDA says certain citrus oils can harm skin exposed to sun. [2]
Does grapefruit oil help with PMS?
One randomized trial of 90 women reported lower symptom scores after smelling it; this is limited evidence. [5]
Does grapefruit oil help with weight loss?
Proper evidence not found.
What if a child swallows grapefruit oil?
Call Poison Help at 1-800-222-1222 (US). [1]
References
- Poison Control (National Capital Poison Center). Essential oils: Poisonous when misused. Read 2026-10-23.
- U.S. Food and Drug Administration. Aromatherapy. Read 2026-10-23.
- GBIF Secretariat. GBIF Backbone Taxonomy: species name matching for Citrus limon, C. bergamia, C. x aurantium, C. sinensis, C. x paradisi, C. x aurantiifolia, C. reticulata. Read 2026-10-23.
- U.S. Food and Drug Administration. Grapefruit Juice and Some Drugs Don't Mix. Read 2026-10-23.
- The effect of aromatherapy intervention with Bergamot and Grapefruit essential oils on premenstrual syndrome and menstrual symptoms: a randomized controlled trial. BMC Complement Med Ther. 2025 (abstract read via PubMed). Read 2026-10-23.
- Aromatherapies using Osmanthus fragrans oil and grapefruit oil are effective complementary treatments for anxious patients undergoing colonoscopy: A randomized controlled study. Complement Ther Med. 2017 (abstract read via PubMed). Read 2026-10-23.