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Collagen Peptides
Bioactive peptide fragments derived from collagen protein hydrolysis, among the most widely consumed supplements globally for skin, joint, and bone health support.
Overview
Collagen peptides (also called hydrolyzed collagen or collagen hydrolysate) are a mixture of small peptide fragments produced by enzymatic hydrolysis of collagen, the most abundant protein in the human body. Collagen provides structural support to skin, bones, cartilage, tendons, and blood vessels. The hydrolysis process breaks collagen's large triple-helix structure into smaller, bioavailable peptides of 2,000-5,000 Daltons that can be absorbed through the gastrointestinal tract.
The supplement industry for collagen peptides has experienced explosive growth, becoming a multi-billion dollar market. Collagen peptides are typically sourced from bovine (cow), porcine (pig), marine (fish), or chicken sources, with marine collagen peptides gaining particular popularity. The primary types used are Type I (predominant in skin and bones), Type II (predominant in cartilage), and Type III (found alongside Type I in skin and blood vessels).
Clinical research on oral collagen peptides has shown several promising results. Randomized controlled trials have demonstrated improvements in skin hydration, elasticity, and wrinkle depth after 4-12 weeks of supplementation. Studies have also shown benefits for joint health, including reduced joint pain in athletes and osteoarthritis patients. Research on bone density has shown potential for collagen peptides to improve bone mineral density in postmenopausal women, particularly when combined with calcium and vitamin D.
The proposed mechanism involves the bioactive peptide fragments acting as signaling molecules that stimulate fibroblasts in the skin, chondrocytes in cartilage, and osteoblasts in bone to increase production of new collagen and extracellular matrix. Specific dipeptides like hydroxyproline-glycine (Hyp-Gly) and proline-hydroxyproline (Pro-Hyp) have been identified as the primary bioactive fragments that reach target tissues after oral absorption. While the evidence base continues to grow, collagen peptides are among the most scientifically supported popular supplements.