Collagen is an inert, rigid protein found predominantly in skin, ligaments, bones and teeth. Its most distinctive attribute, essential to a transmitter of mechanical force, is inelasticity. Its fundamental structural unit is tropo-collagen, a molecular rod about 2600A in length and 15A in diameter and 300,000 molecular weight. In tendons these macromolecules, grouped as collagen fibrils, run parallel to the axis. In skin the fibrils are interlaced and branched. Storage and Stability: Product is stable for 6 months after receipt at 4C. Certificate of Origin: All products from animal sources are produced from starting material of North American origin, collected in United States Department of Agriculture (USDA) approved facilities and inspected to be free of disease.
