GHK-Cu is the one compound where the metal ion is the point. Verification, colour interpretation and storage all work differently — here is what changes.
GHK-Cu is a tripeptide (glycyl-L-histidyl-L-lysine) bound to a copper(II) ion. The copper is not an impurity or an additive — it is a structural part of the complex, and it is why the lyophilised powder is distinctly blue.
Reading the colour correctly
- Deep royal blue powder indicates a well-formed complex
- Pale or patchy blue can indicate incomplete complexation or moisture ingress
- Green tones suggest oxidation or contamination and warrant a check against the published certificate
- Colour is an indicator, never a substitute for the analytical result
Verification differs from standard peptides
A standard HPLC purity figure describes the peptide backbone. For GHK-Cu, copper content must also be reported, because a certificate showing 99% peptide purity says nothing about whether the copper is correctly bound. Vitality Labs publishes both figures per lot.
| Parameter | Why it is reported | Vitality Labs release standard |
|---|---|---|
| Peptide purity | Confirms the GHK backbone | ≥99% by HPLC |
| Copper content | Confirms complexation stoichiometry | Reported per lot on the certificate |
| Mass confirmation | Rules out same-weight impurities | LC-MS within tolerance |
Frequently asked
Why does GHK-Cu cost more per milligram than a plain tripeptide?
The complexation and purification steps add manufacturing stages, and copper content verification adds an analytical step on top of standard HPLC-MS release.
Does light exposure matter?
Copper complexes are more sensitive to light and moisture than plain lyophilised peptides. Store vials sealed, dark and refrigerated.
