Levulinic Acid God Antioxidant Anti-aging Levulinic Acid at a glance Occurs in many natural and processed foods Byproduct of certain biorefinery processes Skin conditioning ingredient + possibly a penetration enhancer Maximum usage in leave-on products is 0.0005% Levulinic Acid description Levulinic acid occurs in many natural and processed foods, including papaya, rice, sake, and wheat bread. It can also be produced during the biorefinery process of wood, algae, and starchy crops. In cosmetics, it serves as a skin conditioning ingredient; in the medical field, levulinic acid has also been investigated for potentially enhancing the skin penetration of certain drugs and having antimicrobial properties. The independent Cosmetic Ingredient Review board is currently reviewing data on the safety of levulinic acid as used in skin care products. In its raw form it is a solid with a low melting point. It has a maximum usage of 4.5% in hair dyes and 0.0005% in leave-on formulations. Related ingredients: Sodium Levulinate