Collagen is a type of protein that connects and supports bodily tissues such as skin, bone, tendon, muscle and cartilage. It also supports internal organs. There are 25 types of collagen naturally occurring in our body and constitute 25% of the total protein in our body. Collagen works with elastin to support body tissues to give firmness and strength in lungs, bones, tendon and blood vessel. It works with keratin to give skin strength, flexibility and resiliency. As we age, the body produce less collagen, hence, the skin loses elasticity and resiliency and resulting in wrinkles and fine lines. So, to retain our youthful look, we have to do something. The.