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

GHK-Cu is a naturally occurring tripeptide (glycyl-L-histidyl-L-lysine) complexed with a copper(II) ion. It was first isolated from human plasma in the 1970s and has since become one of the most frequently studied peptides in dermal-fibroblast, wound-healing and extracellular-matrix (ECM) research. Its concentration in human plasma is reported to decline with age, which underpinned early hypotheses linking GHK-Cu to skin-regeneration research models.

Mechanistically, GHK-Cu is characterised as a copper-delivery vehicle. In vitro studies describe upregulation of collagen I, elastin and glycosaminoglycan synthesis in fibroblast cultures, alongside modulation of matrix metalloproteinases (MMPs) — the enzymes responsible for ECM remodelling. Transcriptomic studies of GHK-Cu-treated fibroblasts have documented differential expression of genes involved in tissue remodelling, antioxidant defence and DNA repair, making it a common reference compound in cosmetic-science literature.

In wound-repair models, GHK-Cu is used to study angiogenesis and re-epithelialisation. The copper ion contributes to superoxide-dismutase activity and cross-linking of collagen and elastin fibres; the peptide component appears to modulate receptor-mediated signalling that promotes fibroblast proliferation and migration in scratch-assay models.

Laboratories working with GHK-Cu typically reconstitute the lyophilised material in sterile water or bacteriostatic water and protect the solution from light, as the copper complex is photosensitive. Storage at 2-8 °C after reconstitution is standard, with lyophilised material stored at −20 °C for long-term stability.

Comparative studies often place GHK-Cu alongside other cosmetic-research peptides such as Matrixyl (palmitoyl pentapeptide-4) and Argireline (acetyl hexapeptide-8) to characterise complementary or overlapping effects on ECM turnover.

This article is intended as an educational overview for laboratory researchers evaluating reference peptides for cosmetic and dermal-research models and does not describe human use.