Vitamin C ethyl ether is a very useful vitamin C derivative, which is not only chemically stable, but also a non-discoloring vitamin C derivative, and an lipophilic and hydrophilic amphoteric substance. This has greatly expanded his scope of application, especially in daily chemistry. 3-O-Ethyl-L-ascorbic acid can easily enter dermal layer through cuticle, and after entering skin, it can be easily decomposed by biological enzyme to play the role of vitamin C, thus improving its bioavailability, while ordinary vitamin C is difficult to be absorbed by skin and its bioavailability is very low. Compared with common vitamin c, vitamin c ethyl ether also shows high stability.