Collagen has the functions of pure natural moisturizing, whitening, anti-wrinkle, and freckle removal, and can be widely used in beauty products. The chemical composition and structure of collagen give it the foundation of beauty. The structure of collagen is similar to that of human skin collagen. It is a water-insoluble fibrous glycoprotein. The molecule is rich in a large number of amino acids and hydrophilic groups. It has a certain surface activity and good compatibility. At the same time, it contains A lot of hydroxyl, so it has a very good moisturizing effect. When the relative humidity is 70%, it can still retain 45% of its own weight. Tests have proved that: 0.01% pure collagen solution can form a good water-retaining layer and supply all the moisture needed by the skin.