3-O-ethyl-L-ascorbic acid, or ethyl ascorbic acid is a molecule produced by modifying Ascorbic Acid, commonly known as Vitamin C.Its hydrophilic and lipophilic characteristics not only make it convenient to use in formulas, but also make it easier to penetrate the stratum corneum and enter the dermis. After entering the skin, it is easily decomposed by biological enzymes and exerts the role of vitamin C, thus improving its bioavailability. .