What it is
Thymol is a monoterpene phenol that is the main aromatic constituent of thyme essential oil. In cosmetics it is used for its characteristic herbal scent and for its ability to help protect formulations, and it can contribute antioxidant activity. Because it is an aromatic phenol, it is used in small amounts.
Safety & warnings
As an aromatic phenol, thymol can be irritating or sensitizing at higher concentrations, so it is used at low levels. It is associated with fragrance-type reactions in sensitive individuals, and very reactive skin may benefit from caution.
Origin & sourcing
Can be naturally derived from thyme and certain other plants or produced synthetically; the cosmetic-grade material may be either depending on source.
History
Thymol has long been recognized as the active aromatic component of thyme and has been used historically in aromatic and antiseptic preparations.
Questions everyone asks
What is thymol derived from?
It is the main aromatic phenol in thyme essential oil and can also be made synthetically.
Why is it used in small amounts?
As an aromatic phenol it can be irritating at higher levels, so it is included at low concentrations for fragrance and formula protection.