Collagen is the real part of protein and is broadly dispersed in human body. It comprises around 1/3 of the aggregate protein in human body and contributes 5-6% of human body weight. Collagen is an essential building obstruct for the skin and around 70-80% of skin weight. An adult’s body consists of 3kg collagen, mainly in human skin, bones, eyes, teeth, muscles, organs (including heart, stomach, intestines, blood vessel and etc), and also other parts of the body. Its capacity is to keep up the skin and organs in the shape and structure, in the mean time, it additionally repairs the harmed body tissue.