Collagen is a protein of the connective tissue, which makes up about 30% of the body's protein. Collagen is the main biopolymer for living beings. This fibrous protein of the connective tissue comprises 70% of the skin and is necessary element of the human skeleton. It's unique physical and chemical features ensure the transfer of forces from sinews and maintain the appropriate firmness and flexibility of the skin. Collagen is the most abundant protein in the human body, forming strong sheets and cables that support the structure of the skin, internal organs, cartilage and bones, as well as all the connective tissue in between. At the molar mass of 102,000 grams per mole, collagen is an extremely large protein, consisting of thousands of atoms.