GHK-Cu: A Research Peptide Profile

For research use only. Not for human consumption.

GHK-Cu, the copper-binding tripeptide, is one of the most extensively studied peptides in skin-biology and tissue-remodeling research. This profile covers what it is, the areas scientists have investigated it in, and how to handle it properly in the lab — written strictly for a research audience.

What is GHK-Cu?

GHK-Cu is a small copper-binding tripeptide with the amino-acid sequence Glycyl-L-Histidyl-L-Lysine (GHK), complexed with a copper(II) ion (Cu²⁺). The GHK sequence occurs naturally in human plasma, where its concentration was observed to decline with age — an observation that first drew research attention decades ago. Its strong affinity for copper makes it a well-defined model system for studying peptide–metal interactions.

Structure and origin at a glance

• Sequence: Gly-His-Lys (GHK), a three-amino-acid peptide
• Metal complex: bound to a copper(II) ion, hence “GHK-Cu”
• Origin: a naturally occurring sequence first isolated from human plasma; the copper complex is the most-studied form
• Class: copper-binding matrikine / signal-peptide model

What research has explored

In laboratory and cell-culture settings, GHK-Cu has appeared in research investigating:

• Extracellular-matrix and tissue-remodeling biology — how the peptide interacts with fibroblasts and matrix proteins such as collagen and elastin in culture models.
• Copper transport and metal-peptide chemistry — GHK-Cu is a classic model for how small peptides bind, carry, and release copper ions.
• Gene-expression modulation — surveys of its effect on broad panels of genes in cell-based assays.
• Antioxidant and wound-biology research — its behavior in models of oxidative stress and tissue repair.

These remain areas of ongoing scientific investigation. GHK-Cu is supplied strictly for laboratory research; it is not approved for human use, and nothing here should be read as a health, cosmetic, therapeutic, or efficacy claim.

Handling, reconstitution, and storage

GHK-Cu is typically supplied as a lyophilized (freeze-dried) powder, often with a characteristic blue tint from the copper complex. General research handling:

• Reconstitute with bacteriostatic water — see our step-by-step guide, Reconstituting Lyophilized Research Peptides.
• Store the lyophilized powder cold and protected from light; keep reconstituted solution refrigerated and use it within the window appropriate to your protocol.
• Because the copper complex is light- and pH-sensitive, minimize unnecessary exposure and follow your lab’s handling SOPs.

Why purity and third-party testing matter

Peptide research is only as reliable as the material behind it — impurities, incomplete copper complexation, or mislabeled content can quietly invalidate results. Every batch of GHK-Cu from FOR Peptides is >99% HPLC purity and independently third-party lab tested, with a Certificate of Analysis (COA) available. New to COAs? See our guide, How to Read a Certificate of Analysis (COA), which walks through HPLC purity and mass-spec identity.

Explore

• GHK-Cu product page — view purity, COA, and specs
• FOR Regenerative Research category — related compounds
• How to Read a COA and Reconstituting Lyophilized Research Peptides — companion guides

FOR Peptides supplies research-grade peptides for laboratory and research use only. Not for human consumption. Products are not drugs and are not intended to diagnose, treat, cure, or prevent any disease.