Hydroxyacetophenone is a multifunctional phenolic compound used in cosmetics as an antioxidant, skin-soothing agent, and booster to enhance preservative efficacy. It reduces redness and irritation (inhibiting COX-2) and is found naturally in cloudberries. While generally considered safe.

Key Details About Hydroxyacetophenone:

Cosmetic Role: It functions primarily as an antioxidant, preservative booster, and skin-soothing agent. It is often used to reduce the amount of other, more sensitizing preservatives (like phenoxyethanol) needed in a formula.

Benefits: It provides anti-inflammatory, soothing, and antioxidant benefits, helping to neutralize free radicals.

Uses: Commonly found in lotions, creams, hairsprays, and serums at typical concentrations up to 5%, or lower in eye products.

Side Effects: While usually well-tolerated, it has been linked to cases of allergic contact dermatitis.

Natural/Synthetic: It is found naturally in plants like Norwegian spruce and cloudberries but is synthetically produced for consistent, pure, and sustainable use in products.

Chemical Structure: The most common form in cosmetics is p-hydroxyacetophenone (4'-hydroxyacetophenone).