What Is GHK-Cu? Copper Peptide Research Guide
GHK-Cu is a naturally occurring copper-binding tripeptide with the sequence glycyl-L-histidyl-L-lysine complexed to a copper(II) ion. It is unusual among research peptides in that it is a metal complex, which affects both its appearance and its handling.
The copper complex
The GHK tripeptide binds copper(II) with high affinity. The resulting complex is what gives reconstituted GHK-Cu its characteristic deep blue colour — a useful visual confirmation that the complex is intact.
Plasma levels of GHK decline markedly with age in published measurements, which is the starting point for much of the research interest in the molecule.
What the literature investigates
GHK-Cu is studied for its effect on gene expression, with published transcriptomic work reporting modulation of a large number of human genes in cell models.
Applied research lines include collagen and glycosaminoglycan synthesis in dermal fibroblast models, antioxidant signalling, and wound-model tissue remodelling.
Handling notes
GHK-Cu is light-sensitive and the copper complex can be disrupted by strongly acidic or chelating conditions. Keep vials in the dark and avoid contact with chelating agents.
Reconstituted solution should be a clear blue; cloudiness or colour loss indicates the complex has been compromised.
Frequently asked questions
- Why is GHK-Cu blue?
- The blue colour comes from the copper(II) ion bound to the GHK tripeptide. A clear blue solution indicates the complex is intact; loss of colour suggests it has been disrupted.
- How should GHK-Cu be stored?
- In the dark, refrigerated once reconstituted, and away from chelating agents that could strip the copper from the complex.
All information on this page is provided for laboratory and educational reference only. Peptides Lab SA (PTY) Ltd supplies compounds strictly for in-vitro research use. Nothing here is medical advice, a dosing recommendation, or a claim of human safety or efficacy.