what is collagen made of
Collagen is a protein made up of amino-acids, which are in turn built of carbon, oxygen and hydrogen. Collagen contains specific amino acids â Glycine, Proline, Hydroxyproline and Arginine. Collagen makes up approximately 30% of the proteins within the body.ollagen microscopically occurs in elongated fibrils. It is mostly found in fibrous tissues such as tendon, ligament and skin, and is also abundant in cornea, bone, blood vessels, cartilage, intervertebral disc and the digestive tract. In muscle tissue, collagen serves as a major component of endomysium.