The Youth Theory - Premium Collagen Peptides - 250gPure Collagen Peptides Type I & III Collagen Collagen is the most abundant protein in your body. By dry weight, collagen makes up 70 80% of your skin, 60% of cartilage and 30% of your bones. Research shows that you lose 1% of collagen per year after the age of 25. As the most common source of protein in the human body, collagen is a major supplier of flexibility, firmness and resistance in many organs, particularly in skin. Ingredients Pure Bovine