Collagen Dipeptide

Collagen dipeptides, principally Pro-Hyp (Prolyl-Hydroxyproline) and Hyp-Gly (Hydroxyproline-Glycine), are the primary bioavailable fragments generated during digestion of hydrolyzed collagen supplements. These short peptides are detectable in human plasma after oral ingestion and are believed to be the active agents responsible for the skin, joint, and bone benefits attributed to collagen supplementation.

Pro-Hyp and Hyp-Gly survive intestinal digestion intact and are absorbed into circulation. They act on dermal fibroblasts to stimulate type I collagen and hyaluronic acid synthesis, and on chondrocytes to promote cartilage matrix production. Pro-Hyp has been shown to activate fibroblast proliferation and migration. These dipeptides may also act as chemotactic signals that recruit fibroblast precursors to the dermis. The hydroxyproline content is unique to collagen proteins, explaining the specificity of these fragments.

Human pharmacokinetic studies confirm that Pro-Hyp reaches measurable plasma concentrations (0.5–10 µM) after oral hydrolyzed collagen intake. Controlled clinical trials of hydrolyzed collagen supplements report improvements in skin hydration, elasticity, and wrinkle depth over 8–12 weeks. Joint pain reduction in athletes has been shown in several placebo-controlled trials. Pro-Hyp specifically has demonstrated in vitro fibroblast-stimulating activity consistent with observed clinical benefits.

Peptides commonly paired with Collagen Dipeptide for synergistic effects.