(1) Trophism: It can offer nutrient to human skin containing collagen, supply 18 kinds beneficial amino acids, reinforcing skin collagen's activity. And it also maintains moisture of horny layer and fiber structure's integrality, so as to improve skin cell's living environment and promote skin tissue's metabolism. Cosmetic grade fish collagen may achieve such efficiencies as moistening skin, postponing selinity, hairdressing and wrinklechasing.

(2) Renovation: Collagen has good affinity with skin tissues, so it can effectively repair skin tissues.

(3) Molding moisture: Fish collagen has nicer efficiency of molding moisture, for it contains a lot of hydrophilic groups.

(4) Compatibleness: Collagen may regulate and stabilize PH value, stabilize foam, emulsify colloid. As a functional ingredient, collagen used in cosmetics may alleviate irritative matter's harm, such as surface active agents, acids, alkalis.

(5) Compatibility: Collagen has better affinity with protein surface on hair and skin, it is combined with hair and skin generally by physical adsorption, it is able to bear rinsing. Affinity's enhancement is along with relative molecular weight's increase. Small molecular can infiltrate scarfskin of skin and hair, sometimes may permeate cortical layer. Each big molecular has more binding sites, so binding force reinforce, appetency increase.