From the Manufacturer: Collagen is the ‘glue’ that holds us together. This major structural protein is found in hair, skin, joints, bones, blood vessels and connective tissues.   Youtheory® Collagen for Men supplies high-quality collagen peptides to help counteract age-related collagen loss.* 5,000 mg of pure collagen peptides Highly absorbable Enhanced with Vitamin C & Biotin* Dairy-free Soy-free No gluten ingredients