What is collagen? Collagen is the most common protein that is produced in the human body. Collagen has various roles to benefit the body, but the most visible role is its power over our skin. Collagen makes the mold of our skin and strengthens it while helping replace and restore dead skin cells. When we're young, the natural process of producing collagen is consistent. However, as we age, the production of collagen in our bodies declines, making our skin sag and leading a quicker path to wrinkl