Collagen is a major structural protein in the human body (found in skin, joints, bones, blood vessels and connective tissues). As we age, collagen naturally breaks down and diminishes over time - leading to the early signs of aging. Youtheory Collagen Advanced Formula with added Vitamin C is designed to help replenish the body's supply of this vital protein. This product delivers intensive nourishment to help counteract the effects of the aging process.