Namely
Potassium benzoate is used in cosmetics for its fungistatic properties as a preservative. It is found in foods under the number E212. It is naturally present in some fruits like cranberries. Potassium benzoate is permitted in organic form.
Restriction in Europe:
V/1a The maximum concentration allowed in ready-to-use cosmetic preparations is 0,5%.
Its functions (INCI)
Preservative : Inhibits the development of microorganisms in cosmetic products.