Evidence Tier: Preclinical (injectable) / Limited Human (topical) — GHK-Cu is a naturally occurring copper-binding tripeptide (Gly-His-Lys-Cu) found in human plasma. Plasma levels decline from ~200 ng/mL at age 20 to ~80 ng/mL at age 60.
Overview
GHK-Cu (glycyl-L-histidyl-L-lysine copper complex) is a naturally occurring tripeptide first identified in human plasma by Dr. Loren Pickart in 1973. It has a strong affinity for copper(II) ions and is involved in numerous biological processes including wound healing, collagen synthesis, and anti-inflammatory signaling.
Mechanism of Action
- Collagen & Elastin Synthesis: Stimulates production of collagen types I, III, and V, as well as elastin, decorin, and glycosaminoglycans
- Metalloproteinase Modulation: Regulates MMP activity for controlled tissue remodeling
- Anti-oxidant Gene Expression: Upregulates superoxide dismutase, glutathione peroxidase, and other antioxidant enzymes
- Stem Cell Recruitment: Attracts mesenchymal stem cells to wound sites
- Anti-inflammatory: Suppresses TNF-alpha, IL-6, and other pro-inflammatory cytokines
Age-Related Decline
Plasma GHK-Cu levels decline significantly with age. Studies report approximately 200 ng/mL at age 20, dropping to approximately 80 ng/mL by age 60 — a 60% reduction that correlates with decreased regenerative capacity.
Research Applications
Topical GHK-Cu has limited human evidence for skin rejuvenation (cosmetic applications). Injectable GHK-Cu remains preclinical. Animal studies demonstrate wound-healing acceleration, reduced scarring, and bone regeneration enhancement.
References
- Pickart L. "The human tri-peptide GHK and tissue remodeling." J Biomater Sci Polym Ed. 2008;19(8):969-988.
- Pickart L, Margolina A. "Regenerative and Protective Actions of the GHK-Cu Peptide in the Light of the New Gene Data." Int J Mol Sci. 2018;19(7):1987.
Research Disclaimer
This article is compiled from peer-reviewed research and publicly available scientific literature. It is intended for educational and informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional before making health-related decisions.