Collagen is the most abundant protein in the body and is what gives our skin and joints structure and keeps them strong and flexible. It’s especially concentrated in the middle layer of our skin and plays a key role in keeping skin moisturized and supple. As we age, collagen levels naturally decline — which can start happening as early as 25. Research has shown that taking collagen regularly can help reinforce the skin's natural moisture barrier, support elasticity, and help reduce the appearance of wrinkles.