What Is GHK-Cu?

GHK-Cu pairs a three-amino-acid peptide with copper. The peptide part, glycyl-histidyl-lysine or GHK, is one of the most frequently cited copper-binding sequences in the research literature. This profile introduces what GHK-Cu is, why copper is central to how it is studied, and the scientific contexts it appears in. It concerns the molecule and its study only.

The GHK sequence has a long history as a naturally occurring tripeptide noted for its affinity for copper ions. Much of the published interest treats the peptide and copper together, as the GHK-Cu complex, because the metal is central to the chemistry that makes the molecule notable. The research material is produced as a defined peptide and studied as this complex; background on assembling short peptides is in how peptides are manufactured.

GHK is a tripeptide of three residues: glycine, histidine and lysine. The histidine is associated with the copper-binding behaviour that gives rise to the GHK-Cu complex dominating the literature, and because copper is involved the complex is often noted for a characteristic colour, which has practical relevance for handling. The material is supplied as a lyophilised powder, as listed on the GHK-Cu product page; the broader idea of what a peptide is sits in what is a peptide?

GHK-Cu’s interest is rooted in being a defined copper-binding peptide. Metal-binding peptides are valuable because the interaction between a small, well-characterised sequence and a specific metal ion can be studied with precision, which makes GHK-Cu a useful model for copper-peptide chemistry. Its small size and the specificity of its copper interaction are the recurring reasons it appears so often in the literature.

Copper is a biologically important metal that acts as a cofactor in a range of enzymes, so peptides that bind it with a defined geometry are of interest as model systems for studying that coordination. GHK’s small size makes it an unusually clean example, since the binding can be related to just three residues.

Worth separating clearly are the GHK peptide and the GHK-Cu complex. The three-residue peptide can be considered on its own, but most of the published interest concerns it together with copper, as a defined complex in which the metal is part of the chemistry. The distinction matters for interpretation and for handling alike, since the integrity of the complex is part of what defines the material’s condition, a theme developed in the storage & handling guide.

Published study of GHK and GHK-Cu spans its copper-binding chemistry and work in matrix-biology and skin-research contexts, including cell-system studies of gene- and protein-expression patterns, with observations belonging to the systems that produced them. GHK-Cu sits among the cosmetic-category research peptides in the research catalogue, and the GHK-Cu research overview takes the study areas further.

All products are supplied strictly for laboratory research use only. Not for human or animal consumption. Not a drug, supplement, or food. Not for diagnostic or therapeutic use. The material on this page is educational and factual: it summarises areas of published scientific investigation and general laboratory practice. It is not guidance for the use of any material in humans or animals, and nothing here should be read as a claim about safety, performance, or outcomes. Where a specific product specification or safety data sheet is provided with a material, that document is the definitive reference and takes precedence over any general information given here.