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Collagen is the principle protein found in Skin and Bones. While some Collagen brands are extracted from various animals, the BEST source of collagen is that which is extracted from the skin of deep water and ocean fish. Collagen is well known and researched and documented as a suppliment that that has many benifits to all human tiisue growth as well as hair, nails and it is also tested in treatment with success for joint care and osteoarthritis and osteoporosis.