Collagen is a biopolymer, the main component of animal connective tissue, and it is also the most abundant and widely distributed functional protein in mammals, accounting for 25% to 30% of the total protein, and some organisms can even reach more than 80%. .

There are many types of collagen, the common types are type I, type II, type III, type V and type XI.

Collagen is widely used in food, medicine, tissue engineering, cosmetics and other fields because of its good biocompatibility, biodegradability and biological activity.

Type Ⅱ collagen is mainly produced by chondrocytes and is mostly found in bones, joints, tendons and other tissues. Type Ⅱ collagen is a kind of high molecular protein. The filamentous collagen fibers are interwoven with elastin and polysaccharide protein to form a network structure, which produces a certain mechanical strength.

Type Ⅱ collagen is mainly responsible for providing moisture to the skin. It is an important part of the skin, and the most abundant in the body is protein. Protein is distributed in various organs of the human body. After the skin loses moisture, the skin will appear. The phenomenon of shriveling, generally older people will experience the loss of collagen, which leads to aging.