The copper peptide category centres on the copper(II) complex of the tripeptide glycyl-L-histidyl-L-lysine (Gly-His-Lys, C14H24N6O4 as the free peptide, 340.4 Da), in which the metal ion is coordinated by the histidine imidazole nitrogen, the N-terminal amine and the backbone amide. Alongside it sit other short synthetic peptides of three to eight residues, several N-acetylated and some bearing a C-terminal amide, that are grouped here by length rather than by any shared chemistry. Because the copper complex is coloured, the lyophilized cake of that compound is blue to violet rather than white; the colour is intrinsic to the complex. The molecular weight on each product page refers to the free peptide or to the complex, as the formula states.
Listed here: GHK-Cu, KPV, SNAP-8 (100mg, 10mg, 80mg, 50mg). Each product page lists the CAS number, molecular formula, molecular weight and, for peptides, the amino-acid sequence. Reported HPLC purity is shown per product; the HPLC and mass-spectrometry identity report is sent by email on request, before you order if you want to see it first.
Guides: GHK-Cu: CAS Numbers, Molecular Weight, Copper Complex vs Free GHK and Why the Powder Is Blue · Peptide Registry Records: When PubChem, CAS and a Listing Disagree · Peptide Sciences Shut Down (March 2026): Status and Listings · Peptide Sequence Notation: One-Letter and Three-Letter Codes, Termini and Modified Residues · TFA vs Acetate Peptide Salts: Counter-Ion by Compound and What It Adds to the Mass
Frequently asked questions
Which copper peptides and short peptides are listed?
This page currently lists 3 compounds: GHK-Cu, KPV and SNAP-8, each supplied as lyophilized powder in a sealed vial at the nominal quantity printed on the label. Each product page states the CAS number, molecular formula, molecular weight and sequence, the reported HPLC purity for the listing and, where a verified record exists, the structural class, residue count and typical salt form.
What is a copper peptide, chemically?
The name refers to the copper(II) complex of the tripeptide glycyl-L-histidyl-L-lysine (Gly-His-Lys, C14H24N6O4 as the free peptide, 340.4 Da), in which the metal ion is coordinated by the histidine imidazole nitrogen, the N-terminal amine and the backbone amide, one peptide per copper. The complex is usually supplied as an acetate or trifluoroacetate salt. The other entries on this page are short synthetic peptides of three to eight residues, several N-acetylated and some with a C-terminal amide, grouped here by length rather than by any shared chemistry.
Where can I buy copper peptides for laboratory research?
This page lists 3 compounds, GHK-Cu, KPV and SNAP-8, as lyophilized powder in sealed glass vials, sold as chemical reference materials for laboratory research use only. Orders are accepted only for delivery to United States addresses and are placed from a registered account with a confirmed email and an electronic research-use certification. Each product page states the price, the CAS number, molecular formula, molecular weight and sequence, and the reported HPLC purity; the independent HPLC and mass-spectrometry report is sent by email on request, before you order if you want to see it first. The GHK-Cu guide covers the CAS number and formula of the complex, the formula and molecular weight of the free peptide, and why the powder is blue.