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　　Collagen is a protein composed of specific amino acids, including glycine, proline, arginine and hydroxyproline. Collagen accounts for about 30% of human protein, but it is abundant in animals. It connects and supports body tissues in skin, bones, tendons, muscles and cartilage. 　　The function of collagen 　　Collagen has many functions, such as: 　　provides support for […]