Sesame Oil: Dangers, Side Effects and Precautions

Sesame oil is one of the best-tolerated oils in the Ayurvedic pharmacopoeia, used in cooking as well as in massage (abhyanga) or as a mouth rinse (oil pulling). Its main danger does not come from toxicity — it has none in normal use — but from a well-identified and rising risk in the general population: sesame allergy.

Sesame allergy, a real and documented risk

Sesame is among the food allergens whose prevalence is rising fastest. A cross-sectional study published in 2019 in JAMA Network Open estimated that up to 0.5% of Americans may have a sesame allergy, with symptoms suggestive of an IgE-mediated allergy reported in just over 0.2% of respondents; the study also notes that sesame ranks among the most severe food allergens in terms of reactions, with a notable share of allergic adults reporting an emergency-room visit (see the study on Google Scholar). Sesame oil, even refined, can contain enough trace allergenic proteins to trigger a reaction in a sensitized person, whether in food use or, more rarely, on the skin.

Other possible side effects

Situation	What to know
Acne-prone skin	Its relatively rich texture can promote comedones in some people; test on a small area before broader facial use
Rancid or poorly stored oil	Oxidized sesame oil loses its qualities and can irritate skin or the digestive system; discard if the smell turns sharp or bitter
Known allergy to seeds or nuts	Avoid entirely, including on skin, due to the risk of a cross-reaction
Oil pulling (mouth rinse)	The oil must never be swallowed after rinsing, since it concentrates impurities dislodged from the mouth

Oil pulling: real effectiveness, but not a substitute for brushing

The mouth-rinse use of sesame oil, already covered in our oil pulling article, has encouraging clinical data on plaque-induced gingivitis: a randomized, controlled, triple-blind trial compared sesame oil pulling to a chlorhexidine mouthwash in adolescents with gingivitis, showing a significant reduction in plaque index and gingival index in both groups, with chlorhexidine remaining somewhat more effective (see the study on Google Scholar). This encouraging result does not make oil pulling a substitute for daily brushing or dental care, but a possible complement — provided, precisely, that the oil is never swallowed at the end of the session.

What quality of oil to choose to limit risk?

The quality of sesame oil directly affects how well it is tolerated. A virgin, cold-pressed sesame oil, rather than one refined at high heat with solvents, better preserves its natural compounds and generally turns rancid more slowly if stored well. For skin use or oil pulling, favoring a cold-pressed oil, without added additives or fragrance, reduces the risk of irritation linked to processing residues. The slightly higher price of a quality virgin oil generally reflects this gentler extraction method.

How to limit risks in practice

• Test on a small area of skin before broader use, especially on oily or acne-prone skin;
• Never use sesame oil if you have a known allergy to sesame or other seeds/nuts, even externally;
• Check the smell and color before each use, discarding any oil that has turned rancid;
• Never swallow the oil used for oil pulling, no matter how long the rinse lasted;
• Store in a cool place away from light to limit oxidation.

Precautions

Aside from a known or suspected sesame allergy, sesame oil has a reassuring safety profile in traditional use, whether in cooking, massage or oil pulling. The main point of vigilance concerns people allergic to seeds/nuts, for whom it should be avoided in all forms, and the freshness of the oil itself. For detailed traditional uses, see sesame oil and sesame oil review. For general safety guidance, see our safety and precautions guide.