GHK-Cu Research: The Copper Tripeptide and Tissue Remodeling

GHK is a tripeptide, glycyl-L-histidyl-L-lysine, first isolated from human plasma. It binds copper(II), and the copper complex is known as GHK-Cu. Its small size and strong affinity for copper have kept it at the center of skin and tissue-remodeling research for decades. This summary is for laboratory reference and education only and describes no human or cosmetic use.

A tripeptide that carries copper

Much of the activity studied for GHK-Cu is put down to its role as a copper carrier. Foundational reviews describe the GHK sequence influencing tissue-remodeling processes and copper-dependent enzyme systems (Pickart, J Biomater Sci Polym Ed, 2008). Copper is a cofactor in many repair and antioxidant pathways, so a peptide that delivers it turns up across a wide stretch of the literature.

Skin regeneration and collagen signaling

Skin research is where GHK-Cu is best known. Reviews describe it modulating several cellular pathways relevant to skin regeneration, including extracellular-matrix and collagen-related signaling, in cell culture and animal models (Pickart, Vasquez-Soltero & Margolina, BioMed Res Int, 2015). That's why it comes up so often in cosmetic-science research.

Antioxidant and protective activity

Another line of work looks at GHK-Cu in the setting of oxidative stress, with reviews discussing protective and anti-inflammatory activity against degenerative changes in research models (Pickart, Vasquez-Soltero & Margolina, Oxid Med Cell Longev, 2012).

Note: these findings are preclinical, from cell culture and animal studies. Research material is for laboratory research use only, not for human, cosmetic or veterinary use.

FAQ

How do GHK and GHK-Cu differ?

GHK is the tripeptide on its own. GHK-Cu is the same peptide with a copper(II) ion bound to it. Much of the activity that has been studied is attributed to the copper complex.

References

1. Pickart — GHK & tissue remodeling (J Biomater Sci Polym Ed, 2008)
2. Pickart et al. — GHK & multiple skin-regeneration pathways (BioMed Res Int, 2015)
3. Pickart et al. — GHK-Cu & oxidative stress (Oxid Med Cell Longev, 2012)