Collagen is protein molecules made up of amino acids. It is the most abundant protein in the human body, accounting for just over 30% of your body’s total proteins. Collagen provides structural support to the extra cellular space of any connective tissue such as joints, tendon, etc. It is somewhat like molecular cables that strengthen the tendons that support your joint tissue, skin, artery linings, and internal organs. Bones and teeth are made in the body by adding mineral crystals to collagen. There different types of collagen based on where it is found. For example type II collagen is only found in joints.