NB

Collagen can be used in the construction of artificial skin substitutes used in the management of severe burns. This may be derived from bovine (cows), procine (pigs), equine (horses) or even human sources and are sometimes used in combination with silicones, glycosaminoglycans, fibroblasts, growth factors and other substances.
Human collagen is derived from donor cadavers, placentas and aborted foetuses and has a low possibility of immune reactions.
Collagen is sold as a pill as a supplement to help with joint mobility. However, since proteins are broken down into amino acids before absorption, an orally taken pill may not really affect connective tissue in the body, except through the effect of individual amino acid supplementation.