Ursolic acid, also known as urson, prunol, micromerol, and malol, is a pentacyclic triterpenoid compound which naturally occurs in a large number of vegetarian foods, medicinal herbs, and other plants^1,2. For a long time, it was considered to be pharmacologically inactive3. Thus, ursolic acid and its alkali salts (e.g. potassium or sodium ursolates) were exclusively used as emulsifying agents in pharmaceutical, cosmetic, and food preparations^3,4. However, upon closer examination, ursolic acid was found to be medicinally active both topically and internally¹. Its anti-inflammatory, anti-tumor (skin cancer), and antimicrobial properties make it useful in cosmetic applications¹.