GHK-Cu: what the research shows.
GHK-Cu is a naturally occurring tripeptide (glycine–histidine–lysine bound to copper) identified in human plasma in 1973. It is studied for wound healing and skin biology, where it stimulates collagen and tissue remodeling signals in cell and animal studies. Human evidence is mostly small cosmetic trials; it is not an approved medicine, and cosmetic "copper peptide" products differ from research-grade peptide.
What is GHK-Cu?
GHK-Cu is a tripeptide — glycine, histidine, and lysine — with a strong natural affinity for copper(II), which it binds and carries into cells. It was identified in human plasma in 1973, and its concentration in the body appears to decline with age, which is why it became a focus of aging-related research.
Unlike the GLP-1 compounds, GHK-Cu is not an approved medicine, but it is a legal and common cosmetic ingredient. Those are two very different use contexts; see our GHK-Cu serum vs research peptide article for the distinction.
How it works
- Copper transport — GHK-Cu delivers copper, a required cofactor for enzymes that cross-link collagen and elastin.
- Gene expression — cell studies show GHK-Cu shifts expression of a large set of genes toward a younger profile, with collagen synthesis up and inflammatory signaling down.
- Tissue remodeling — it stimulates fibroblasts, angiogenesis, and wound contraction in animal models.
What researchers are studying
- Dermal wound healing and contraction
- Skin firmness, fine lines, and photoaged skin (small cosmetic trials)
- Post-injury tissue remodeling
- Hair follicle biology
- Systemic aging biology, given its age-linked decline
What the research shows
Animal and cell data on wound healing are consistent and long-standing. The human data is dominated by small cosmetic studies — typically a few dozen participants, measuring skin appearance metrics — which show modest improvements in firmness and wrinkle parameters but are too small to be conclusive.
Research limitations
- Intact peptides penetrate skin poorly; cosmetic effects depend on formulation.
- Human trials are small, mostly industry-sponsored, and rarely replicated.
- Oral GHK-Cu is degraded in digestion — it is not an oral supplement candidate.
- The cosmetic and research-grade supply chains are completely different; purity expectations differ too — see peptide purity.
Common terminology
- Tripeptide — a chain of three amino acids.
- Copper chelation — binding of copper ions by the peptide.
- ECM (extracellular matrix) — the collagen-rich scaffold between cells.
- Fibroblast — the cell that builds and maintains the ECM.
Questions. answered.
Is GHK-Cu naturally found in the body?
Yes. GHK is a naturally occurring human tripeptide identified in plasma, saliva, and urine; its levels decline with age.
Do copper peptide skincare products contain the same thing?
They use the same peptide for cosmetic purposes, but cosmetic formulations, concentrations, and quality oversight differ completely from research-grade material.
What does the human research show?
Small cosmetic trials report modest improvements in skin firmness and wrinkles; there are no large human trials.