Collagen is the main component of connective tissue of animals

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

Animal tissues derived from livestock and poultry are the main way for people to obtain natural collagen and collagen peptides. However, due to related animal diseases and some religious beliefs, people have limited the use of terrestrial mammalian collagen and its products, and are gradually turning to the exploitation of collagen from Marine organisms.  The European Food Safety Authority (EFSA) has confirmed that even collagen derived from animal bones is not likely to be infected with mad cow disease and other related diseases.  

Due to the differences in amino acid composition and crosslinking degree, etc, make the aquatic animals, especially its processing waste - skin, bones, scale is contained in rich collagen has many advantages of cattle collagen did not derived from Marine animal collagen in some other aspects are better than those of collagen of land animals, such as those with low antigenicity, hypoallergenic properties, etc.  Therefore, aquatic collagen may gradually replace terrestrial animal collagen.  

Due to its good biocompatibility, biodegradability and biological activity, collagen has been widely used in food, medicine, tissue engineering, cosmetics and other fields.  For example, "Ejiao", a traditional Chinese collagen health care product, is mainly made from donkey skin (in fact, collagen is contained in donkey skin), which has high nourishing and health care effects and is reputed as one of the three treasures of Traditional Chinese medicine.