Ejiao is a rubber block made from the skin of an animal donkey by soaking and unhairing. Ejiao is composed of collagen. Traditional Chinese medicine Ejiao: It is made from Dong 'e Ejiao, and there are many trace elements in Dong 'e water. The boiled donkey-hide gelatin is pure and delicious, rich in collagen and various trace elements. The older Ejiao is, the better. Strictly speaking, Ejiao has no shelf life, as long as there is no mildew and odor on the surface, it can be eaten.