Ethyl Ascorbic Acid is a lipophilic derivative of a water-soluble of vitamin C, not only in the formulation to be very convenient to use and more easily penetrate it into the dermal layer of the stratum corneum, into the skin easily decomposed by enzymes play a role of vitamin C, thereby increasing its bio-availability, and ordinary vitamin C is difficult to be absorbed through skin, bio-availability is very low. Moreover, vitamin C ethyl ether is relatively common in vitamin C also show high stability.