Thymus Vulgaris Extract

Thymus vulgaris (thyme) extract is a botanical antimicrobial/antioxidant that can contain sensitizing fragrance components (e.g., thymol/carvacrol) depending on extraction method, and it has documented potential to trigger irritation or allergic contact dermatitis in reactive or eczematous skin. In typical leave-on cosmetic use levels, many tolerate it, but the variability in composition and higher risk in compromised barriers warrants treating it as a notable irritant that should be introduced cautiously and patch tested. Safety Notes: In mass-market leave-on skincare (serums, moisturizers, toners) Thymus vulgaris extract is often used as a supporting antioxidant/clarifying botanical at very low levels (commonly as part of a botanical blend), with observed use down to ~0.0005% when supplied as a concentrated extract or within multi-extract complexes. Higher-strength consumer products positioned for oily/acne-prone skin, deodorizing, or scalp/clarifying benefits (including some masks and shampoo/cleanser systems) can reach ~1–2% as the neat extract, with rinse-off formulas typically tolerating the upper end due to reduced skin contact time and odor/sensitization constraints from thyme constituents.