Compound Monograph
Thymol
Thymol is a phenolic monoterpene and the main aromatic component of thyme oil, valued as an antiseptic and flavouring.
Classification
Thymol is a monoterpene phenol, part of the terpenoids class. The largest class of plant compounds, built from five-carbon isoprene units — the essential-oil aromatics, resins, bitter principles, saponins, and plant sterols.
Where Does It Come From? (6)
Thymol is a naturally occurring monoterpene phenol, found in Thyme, Oregano, Catnip and 3 other sources. It is well tolerated orally (low toxicity).
Research & Evidence
Thymol is a phenolic monoterpene and the principal aromatic constituent of thyme oil, also present in oregano and other herbs. It has well-documented antiseptic, antibacterial and antifungal properties and a long history of use in oral hygiene products, throat preparations and as a preservative and flavouring; it is one of the active agents in some commercial mouthwashes.
Toxicity & Safety
At the low concentrations used in foods, mouthwashes and topical products, thymol is well tolerated. As a concentrated phenol, however, the pure compound and undiluted thyme oil can irritate skin and mucous membranes, and large ingested amounts can be harmful, so essential oils containing it should be properly diluted and kept away from children.