Many people take a daily collagen supplement or add collagen powder to their morning coffee, tea, or smoothie in hopes of supporting their skin, joint and hair health. With the increase in the use of collagen supplements and other collagen products, most people do not know what collagen is or what it does in the body. This article tells you everything you need to know about collagen, including what it is, what it does to your body, and whether collagen supplements are worth it. collagen peptides side effects