Ascorbic acid, better known as vitamin C, is a water-soluble vitamin. It acts as an antioxidant, neutralizes free radicals and contributes to the stability of sensitive ingredients. In biochemistry, it is closely linked to processes that affect the formation of collagen and various functions of the immune system. In cosmetic formulations, vitamin C is used due to its antioxidant properties to increase product stability and visually even out the complexion. Thanks to its water solubility, it is widely used in cosmetics and food supplements.