Collagen is a protein that is found in the skin, bones, nails, tendons and other tissues. Collagen helps to make up these tissues and also keeps them safe from bacteria and other harmful substances. However, as we age, our collagen production decreases. As a result of this decrease in collagen, the skin starts developing wrinkles and sagging. This can be prevented by taking care of your skin everyday. One way to do this is by using collagen supplements in your diet which can help with collagen production.