Collagen will produce itself. Beef tendon, pig's trotters, fish and other foods contain collagen, which can be ingested by eating. The collagen content of aquatic animals is higher than that of terrestrial animals, such as silver carp, bighead carp and grass carp. The protein content is 25.9%, 23.6% and 29.8% respectively, which are higher than the protein content of their corresponding fish: 17.8.

The content of collagen in fish skin can exceed 80% of its total protein, which is much higher than other parts of fish. It has been reported that collagen in the skin of red snapper accounts for 80.5% of crude protein, while in eel it is as high as 87.3%. Such a high content means a high yield, such as 42.5% for small tuna; Japanese sea bass 40.7%; Fragrant fish 53.6%; Yellow sea snapper 40.1%; Bamboo pod fish 43.5% (all calculated by dry weight).

Extended data:

Collagen can achieve the purpose of whitening by inhibiting the production process of melanin. In addition, it has a triple helix structure, which can strongly lock in 30 times of moisture, making the skin moist, shiny and tender for a long time. Collagen contains hydrophilic factors, which can effectively and firmly lock our water.

Collagen can quickly fill local collapse, improve relaxation, tighten skin, reduce wrinkles and smooth fine lines after entering dermal tissue. Collagen can form a calcium attachment network, lock bone calcium and prevent calcium loss! More importantly, it has a good effect on repairing articular cartilage. The lubrication of articular cartilage surface can be well repaired, thus reducing friction.

Baidu encyclopedia-collagen