GHK-Cu: The Copper Peptide in Skin and Repair Research

GHK-Cu is one of the best-known peptides in both cosmetic science and laboratory research. This guide covers what it is, what studies have looked at, and what to check when buying research material.

What GHK-Cu is

GHK is a tripeptide — glycine, histidine, lysine — that occurs naturally in human plasma, saliva and urine. It binds copper(II) ions very tightly, and the copper complex is called GHK-Cu. Plasma levels of GHK are reported to fall with age, which first drew researchers to it.

A related compound, AHK-Cu, swaps glycine for alanine and is studied mainly in hair-follicle models. A palmitoylated version without copper, Pal-GHK, is common in cosmetic formulations.

What the research looks at

• Fibroblast activity. Cell-culture work measures collagen, elastin and glycosaminoglycan production by dermal fibroblasts.
• Matrix remodelling. GHK-Cu is reported to influence both matrix metalloproteinases and their inhibitors, which is relevant to how tissue is built and broken down.
• Wound models. Animal studies of wound contraction and new blood vessel formation.
• Gene expression. Large-scale analyses suggest GHK shifts the expression of many genes at once, which partly explains why it is described as having broad effects.
• Copper delivery. Part of its activity may come from delivering copper, a cofactor for enzymes such as lysyl oxidase that cross-link collagen.

Cosmetic vs research use

Much consumer interest comes from skincare, where GHK-Cu is an established cosmetic ingredient. Research-grade GHK-Cu sold as lyophilised powder is a different product category: it is labelled for laboratory use only, and is not a cosmetic or a medicine.

Comparing GHK-Cu listings

1. Check the colour and form. GHK-Cu powder is typically blue because of the copper. Ask the supplier about the copper-to-peptide ratio.
2. Use price per mg. GHK-Cu is often sold in larger vial sizes (50–100 mg), so headline prices can mislead. See current prices on our GHK-Cu comparison page.
3. Watch for blends. GHK-Cu is a component of GLOW and KLOW blends. See our blends guide.
4. Request a batch CoA with HPLC purity and mass-spec identity.

Summary

GHK-Cu is a naturally occurring copper peptide with a large body of cell and animal research and a long history in cosmetic science. For research buyers, the key checks are identity, copper content and price per milligram. PeptideCompare gives no dosing or usage guidance, and nothing here is for human or veterinary use.