Ethyl Ferulate

Ethyl ferulate is an antioxidant/UV-stabilizing derivative of ferulic acid typically used at low concentrations (about 0.1–1%) in serums and sunscreens, where it is generally well tolerated. While it is not an exfoliating acid at functional use and is less reactive than free ferulic acid, it can still trigger stinging or dermatitis in a minority of highly reactive or eczematous patients (especially in alcohol-based formulas or when combined with other actives). Given the limited robust irritation data versus more established antioxidants and the need to protect very sensitive populations, it fits best as a generally gentle ingredient with a small but real irritation risk. Safety Notes: Ethyl ferulate is typically used as a lipophilic antioxidant/photostabilizing booster in leave-on serums, lotions, and sunscreens at low levels around 0.01–0.2%, where it complements vitamins C/E and UV filters without impacting sensory. Mid-range use in antioxidant facial oils and emulsions commonly falls around 0.3–1.0%. A smaller number of consumer-available “booster”/high-antioxidant leave-on products and anhydrous concentrates push to ~2–3% before solubility, odor/color, and stability constraints become limiting; rinse-off products, when present, are usually at the low end due to limited contact time.