Youtheory Collagen Plus Biotin, 390 TabletsED. 01 2027 Youtheory Advanced Collagen features 6,000 mg of easily digested and highly absorbable collagen peptides per serving, plus a daily dose of vitamin C to help aid normal collagen formation and boost antioxidant protection. Collagen is a major structural protein in the human body (found in skin, joints, bones, blood vessels and connective tissues). As we age, collagen naturally breaks down and diminishes over time, leading to the early signs