... and keep health according to absorption from man-made collagen. Collagen can be extracted from Skin or Gristle of fresh ... its very edible. Take different techniques, there are Hydrolyzed Collagen, Active Collagen, Collagen Peptide, Geltin and so on.Function 1.Can protect ... bones hard and flexible, not loose fragile;3. Can protect eye, make cornea transparent;4. Can promote muscle cell connection ...