GHK-Cu — often just called "copper peptide" — is one of the most-referenced compounds in skin and cellular research. The "Cu" is the chemical symbol for copper, and that copper is the whole story. Here's what the molecule actually is and the research fields it turns up in.

What GHK-Cu is

GHK is a naturally occurring tripeptide — three amino acids, glycine-histidine-lysine — first identified in human plasma. On its own it's "GHK." What makes GHK-Cu distinct is that the peptide has a strong affinity for copper ions and binds one, forming a copper complex. So GHK-Cu is the copper-bound form of the GHK peptide, and that copper-binding is central to why it's studied.

The chemistry that makes it interesting

Copper is an essential trace element involved in many enzymatic processes. GHK's ability to capture and deliver copper is what draws research attention — it's studied as a way copper interacts with cellular systems. In the literature you'll see GHK-Cu examined around:

  • Skin and collagen research — the field it's best known in, looking at extracellular matrix components.
  • Wound-healing and tissue-repair models — alongside other repair-research peptides.
  • Cellular signalling and gene-expression studies — how the copper complex influences cell behaviour in vitro.
  • Antioxidant-pathway research.

Because it spans skin, repair and cellular research, GHK-Cu is often studied alongside repair compounds like BPC-157 and TB-500 — and it's a common component of multi-peptide repair blends (see our note on peptide blends).

Handling notes

GHK-Cu is supplied as a lyophilised powder with a characteristic blue tint — that colour comes from the bound copper and is normal. Like other peptides it's stored cold and reconstituted with bacteriostatic water; work out your solution with the reconstitution calculator. Protect it from light once mixed.

What to verify when sourcing

With a copper complex, identity confirmation matters — you want to know the material is genuinely the copper-bound peptide at the stated purity. Every batch we hold is independently tested with a published Certificate of Analysis stating purity and identity; the actual lab results are in the CoA Library before you order.

Shop GHK-Cu and skin-research compounds

All products are supplied strictly for laboratory and in-vitro research use only. Not for human or veterinary consumption. This article describes fields of scientific research and is not medical advice, cosmetic advice, or a claim about effects in humans.