What is GHK-Cu?

GHK-Cu is a copper-binding tripeptide complex consisting of the amino acid sequence glycyl-L-histidyl-L-lysine (GHK) complexed with copper(II) ions. The GHK tripeptide occurs naturally in human plasma, saliva, and urine, with concentrations decreasing with age.

The copper complex is the biologically active form of the peptide. Copper is an essential cofactor for several enzymes involved in extracellular matrix maintenance, including lysyl oxidase (collagen cross-linking) and superoxide dismutase (antioxidant defence).

For UK research laboratories, GHK-Cu serves as a reference compound for studies examining dermal matrix biology, copper-mediated cellular signalling, and extracellular matrix remodelling in controlled in vitro environments.

GHK-Cu operates through the following mechanisms in research models:

Collagen Synthesis — GHK-Cu stimulates collagen type I, III, and IV synthesis in fibroblast cultures. The copper ion activates lysyl oxidase, an enzyme essential for collagen and elastin cross-linking.

Cellular Proliferation — The peptide complex promotes fibroblast and keratinocyte proliferation in cell culture models. GHK-Cu modulates growth factor signalling pathways, including TGF-β and VEGF.

Antioxidant Activity — Copper is a cofactor for copper-zinc superoxide dismutase (SOD1), an important antioxidant enzyme. GHK-Cu may influence cellular antioxidant defences and protect against oxidative stress in cellular models.

Matrix Remodelling — GHK-Cu modulates matrix metalloproteinase (MMP) activity and tissue inhibitor of metalloproteinase (TIMP) expression, influencing extracellular matrix turnover and remodelling.

Gene Expression — The peptide complex influences the expression of multiple genes involved in extracellular matrix production, cellular proliferation, and differentiation, acting through copper-dependent signalling pathways.

GHK-Cu is employed across multiple research domains in UK laboratories:

Dermal Matrix Research — Fibroblast cultures examine GHK-Cu's effects on collagen synthesis, elastin production, and extracellular matrix organisation.

Cellular Proliferation Studies — Keratinocyte and fibroblast proliferation assays measure GHK-Cu's effects on cell growth and cell cycle progression.

Copper Biology Research — Cellular models examine copper transport, copper-dependent enzyme activity, and the role of copper signalling in cell function.

Antioxidant Research — Oxidative stress models measure GHK-Cu's effects on cellular antioxidant defences and protection against reactive oxygen species.

Extracellular Matrix Remodelling — MMP and TIMP expression studies examine GHK-Cu's effects on matrix turnover in fibroblast and co-culture models.

GHK-Cu is supplied as a lyophilised powder. Standard laboratory preparation:

• Bacteriostatic water (0.9% benzyl alcohol) recommended for reconstitution
• Typical concentrations: 1–10 mg/mL depending on assay requirements
• Appearance: The reconstituted solution has a characteristic blue colour due to the copper complex
• Solubility: The peptide complex is soluble in aqueous solutions; gentle vortexing may aid dissolution
• pH: Maintain solutions at pH 6.0–7.5; acidic conditions may dissociate the copper complex

• Lyophilised powder: −20°C, protected from light
• Reconstituted solution: 2–8°C, protected from light
• Stability: 5–7 days under refrigeration; aliquot and freeze at −20°C for extended studies
• Avoid: Repeated freeze-thaw cycles; protect from prolonged light exposure