Collagen, a protein naturally produced in the body, is also a popular supplement and beauty product ingredient that claims to improve the health of your skin. The marketing for collagen products claims they can improve skin elasticity, reduce visible wrinkles, and increase blood flow to the skin. Collagen works by inhibiting the activity of an enzyme called tyrosinase, which is responsible for the production of melanin. When the production of melanin is reduced, the skin appears lighter and brighter. Collagen also helps to improve skin hydration, which is important for maintaining healthy skin