Collagen is a structural protein that plays a role in building hair, skin, bones, and cartilage. Collagen production in the body declines with age, which means you have to supplement with collagen to maintain the same levels as you had in your youth. When it comes to collagen supplements, you'll find there are different types of collagen that play different roles in your body. This article will tell you everything you need to know about collagen types and the benefits each of them provides.