Proteins/collagen are the most important nutrients to ensure the health of the body. It is to maintain the body and necessary for cell growth and repair. Now there are two kinds of protein/collagen.
One is food protein/collagen, it can use in such aspects: Nourishment, Health Products,Cosmetic ...
Other is Industrial protein/collagen, it can use in such aspects:Plant Fertilizer, Fire-fighting Foam, Building, Metalizing...