Youtheory Advanced Collagen with Vitamin C 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. This formula can help you achieve inner health, outer beauty and see the early signs of aging fade away. 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 of aging.