Thymol is a naturally occurring monoterpenoid phenol derived from thyme oil, used in skincare and oral care for its antibacterial, antifungal, and antioxidant properties. It is also employed as a preservative and active agent in some topical antiseptic and acne formulations.
| Reported effect | How often | Notes |
|---|---|---|
Skin irritation | Common | Can cause redness, stinging, or burning, especially at higher concentrations. |
Allergic contact dermatitis | Uncommon | Phenolic compound capable of sensitization in predisposed individuals. |
Mucosal irritation | Uncommon | Irritation of mucous membranes with oral or near-mucosal use. |
Chemical burns | Rare | Reported with concentrated or undiluted exposure. |
Systemic toxicity | Very rare | Possible with ingestion or extensive absorption of large amounts. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.