Collagen is the most abundant protein in your body, making up around one-third of total protein content. It acts like scaffolding for your skin, cartilage, tendons, ligaments, and even the lining of your gut. As a natural part of aging, your body’s collagen production begins to slow down, leading to visible signs like wrinkles and joint stiffness. Lifestyle factors—like UV exposure, smoking, poor nutrition, and chronic stress—can accelerate this decline.