NB

Collagen is the most plentiful protein in the body. It has important roles, including providing structure to your skin and helping your blood clot. In recent years, it has gained popularity as a nutritional supplement and ingredient in natural food.
Collagen is found in the connective tissues of animal foods. For example, it’s found in large amounts in chicken and pork skin. One particularly rich source is bone broth, which is made by boiling down the bones of chicken , fish and other animals.
Gelatin is basically cooked collagen, so it is very high in the amino acids needed to produce it.
But there’s debate over whether consuming collagen-rich foods actually increases the levels in your body.
And you can supplement protein directly, just to eat the hydrolyzed collagen with small molecular weight , it will easily absorbed by human body.