Acetic acid, also known as vinegar acid, is obtained through fermentation and acts as an antimicrobial agent as well as regulating the pH level of a cosmetic formulation. (1)

(1) Kareem G. Elhage;Kayla St. Claire;Steven Daveluy; (2021). Acetic acid and the skin: a review of vinegar in dermatology . International Journal of Dermatology, (), -. doi:10.1111/ijd.15804