Collagen
The most abundant structural protein in the body, organised into types with distinct tissue roles.
For laboratory and research use only — not for human consumption.
Collagens form the principal load-bearing component of connective tissue. Type I dominates skin, tendon, ligament, and bone; type II dominates cartilage; type III is enriched in granulation tissue and scar; type IV forms basement membranes. Collagen synthesis by fibroblasts and tenocytes — and the eventual organisation of these fibres into mature, mechanically competent tissue — is the principal endpoint in many healing-peptide studies. Hydroxyproline content (a collagen-specific amino acid) is the most common quantitative biochemical proxy.