Disclaimer: All products and information referenced are supplied strictly for laboratory and research purposes only. Nothing here is intended for human or animal consumption, nor as medical advice.
Copper peptides in skincare and research-grade GHK-Cu are usually the same molecule, but they are very different products. A serum is a finished cosmetic containing a small amount of GHK-Cu in a formula, regulated as a cosmetic. A research vial is pure, freeze-dried GHK-Cu supplied for laboratory work. This guide explains what GHK-Cu is, how the two forms compare and how to read labels.
What is GHK-Cu?
GHK-Cu is the tripeptide glycyl-L-histidyl-L-lysine bound to a copper(II) ion. It was first identified in human plasma by Loren Pickart in 1973, and its levels fall with age: roughly 200 ng/mL at age 20 compared with about 80 ng/mL by age 60.
Key facts
- Sequence: Gly-His-Lys
- Approx. molecular weight: ~340 Da for GHK; ~400 Da for the copper complex
- Appearance: blue powder (from the bound copper)
- Cosmetic (INCI) name: Copper Tripeptide-1
For full biochemistry, see our GHK-Cu research overview.
Research-grade GHK-Cu vs copper peptide serum
| Research-grade GHK-Cu | Copper peptide serum | |
|---|---|---|
| Form | Lyophilised powder in a sealed vial | Ready-to-use liquid or cream |
| Content | GHK-Cu only, no excipients | Small percentage of GHK-Cu in a formula with water, humectants and preservatives |
| Purity stated | Yes, e.g. ≥98% by HPLC | Rarely; the concentration is often not disclosed |
| Regulation | Research chemical; not for human use | UK Cosmetics Regulation; safety-assessed for skin |
| Intended use | In-vitro and laboratory research | Topical cosmetic use |
The key point: a serum is a regulated consumer product; a research vial is a raw reference material. They are not interchangeable.
What GHK-Cu research has looked at
Most published work comes from Pickart and colleagues and focuses on tissue remodelling.
Skin and wound models
Studies report effects on collagen and glycosaminoglycan synthesis and on wound contraction in animal models. A 2015 review in BioMed Research International summarises this work.
Gene expression
Analysis of the Broad Institute Connectivity Map suggested GHK can shift the expression of a large number of human genes, a finding discussed in a 2018 review in the International Journal of Molecular Sciences.
How to read a copper peptide label
On a skincare product
- Look for Copper Tripeptide-1 in the INCI list. Its position hints at concentration, as ingredients are listed in descending order above 1%.
- A blue tint usually indicates a meaningful copper peptide content.
On a research listing
- Check the stated purity and net peptide mass per vial.
- Check storage instructions and whether batch documentation is available.
Our guide on how to read a peptide product listing walks through each field.
Handling research-grade GHK-Cu
- Before reconstitution: store sealed at −20°C, away from light.
- Compatibility: copper complexes can be destabilised by strong acids and chelating agents, so check buffers before use.
- Calculations: a 50mg vial needs careful dilution maths; use our peptide calculator.
Copper Peptide FAQs
Are copper peptides and GHK-Cu the same thing?
Usually. “Copper peptides” in skincare almost always means GHK-Cu, listed on ingredient labels as Copper Tripeptide-1. A few products use other copper-binding peptides.
Why is GHK-Cu blue?
The blue colour comes from the copper(II) ion bound to the peptide. Pure GHK without copper is white.
Can research-grade GHK-Cu be used in skincare?
No. Research-grade GHK-Cu is supplied for laboratory use only and is not a cosmetic ingredient compliant with UK cosmetics regulations.
What does the “Cu” in GHK-Cu mean?
Cu is the chemical symbol for copper. GHK-Cu is the tripeptide GHK bound to a copper ion.
Summary
Copper peptide serums and research-grade GHK-Cu share the same active molecule but differ in purity, form, regulation and purpose. For laboratory work, PeptidesNextDay supplies GHK-Cu 50mg at ≥98% purity, dispatched same day on orders placed by 3pm (Mon–Fri).