Triacetin

Triacetin (glycerol triacetate) is primarily a solvent/plasticizer and viscosity-modifying ingredient used at low percentages in cosmetics, and it is generally well tolerated with low rates of irritation in standard use. While not completely inert, it is not a sensitizing fragrance component and is less likely to sting compromised skin than many common solvents (e.g., alcohols or propylene glycol). For severe eczema or highly reactive patients, rare irritant reactions can still occur, but overall clinical risk supports a very gentle score. Safety Notes: Triacetin (glycerol triacetate) is used in consumer skincare primarily as a solvent/plasticizer for fragrance and as a humectant/skin-conditioning adjunct, where it is often present at very low levels (~0.05–1%) in lotions, cleansers, and makeup to aid solubilization and sensory. Higher levels are observed in anhydrous or low-water leave-on formats (e.g., perfume/fragrance-adjacent skin oils, certain deodorants/antiperspirants, and specialty solvent-base serums/primer-type products) where it can function as a major carrier and reach ~10–30% in OTC products. There is no specific EU/FDA cosmetic maximum for triacetin; practical limits are driven by odor/feel, solvency needs, and compatibility with the rest of the formula (rinse-off typically stays at the low end, while leave-on solvent systems account for the high end).