Potassium Benzoate
Potassium Benzoate (CAS #582-25-2) is the potassium salt of benzoic acid, used as a preservative in cosmetic and personal care formulations. It is listed under CosIng with the official function of "preservative" and carries a cosmetic restriction classification of V/1a. It appears frequently in cleansers, toners, and other rinse-off and leave-on products.
Potassium Benzoate functions to inhibit microbial growth, thereby extending the shelf life and safety of cosmetic formulations. Its preservative action helps protect products from bacterial and fungal contamination.
Subject to cosmetic use restrictions (CosIng classification V/1a), indicating regulated limits on concentration in finished products. When combined with ascorbic acid (Vitamin C) in formulations, benzoate salts can potentially form benzene; formulators should be aware of this interaction.
