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Powerful Protein + Nutrients Dietary Supplement 5 000 mg of Pure Collagen Peptides Highly Absorbable Enhanced with Vitamin C & Biotin 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.