NUTRIWORKS Collagen and Biotin Worx 250gCollagen is a protein found throughout our body, including the skin. The elasticity and appearance of the skin, hair and nails depends on a sufficient amount of collagen. Unfortunately, with age, the body's ability to naturally synthesize this protein gradually decreases, and it is also reduced by excessive stress, whether from exhausting exercise, stress, or environmental toxins (typically in large cities with high levels of airborne pollutants).