N-UNCOUNT (常用于化妆品或美容手术中，使皮肤显得年轻的)胶原蛋白Collagen is a protein that is found in the bodies of people and animals. It is often used as an ingredient in cosmetics or is injected into the face in cosmetic surgery, in order to make the skin look younger. (常用于化妆品或美容手术中，使皮肤显得年轻的)胶原蛋白
The collagen that is included in face creams comes from animal skin.