02 Collagen is a biological polymer substance, the English name of which is Collagen. It plays the role of binding tissue in animal cells. It is one of the key raw materials for the biotechnology industry***, and is also a biomedical material in high demand. Its application fields include biomedical materials, cosmetics, food industry, research purposes, etc. Collagen is an extracellular protein. It is a fibrous protein twisted into a spiral by 3 peptide chains. Collagen is a protein rich in content*** in the human body. Dr. J. Brandt (J. Brandt), the father of collagen in the world, asserted: “The process of aging in the body is the process of collagen loss!” Collagen accounts for more than 30% of the total protein in the whole body. Collagen is rich in amino acids such as glycine, proline, and hydroxyproline that the body needs. Collagen is an important component of the*** extracellular matrix.