Research peptide article

Copper Peptides in Research: GHK-Cu and AHK-Cu Compared

Published June 9, 2026 · PX-Labs

For laboratory and research reference only. All compounds discussed are sold strictly for scientific research purposes and are not intended for human or veterinary use.

Overview

Copper peptides are short peptides that form complexes with copper ions. Two of the most studied in research are GHK-Cu and AHK-Cu. They are closely related — differing by a single amino acid — which makes them a natural comparative pair. This article covers their structures, the difference between them, and how they relate to the blends they appear in.

What a Copper Peptide Is

A copper peptide is a peptide that binds a copper ion to form a stable complex. The copper-binding property is central to how these compounds are characterized in research. Both GHK-Cu and AHK-Cu are short tripeptides — three amino acids — complexed with copper.

GHK-Cu

GHK-Cu is the tripeptide GHK (glycyl-L-histidyl-L-lysine) complexed with copper. It is a naturally occurring sequence and one of the most widely studied copper peptides.

Structure

Glycine-histidine-lysine + copper

Available from PX-Labs

GHK-Cu — 50mg, 100mg

AHK-Cu

AHK-Cu is the tripeptide AHK (alanyl-L-histidyl-L-lysine) complexed with copper. It differs from GHK-Cu in a single position: alanine in place of glycine as the first amino acid.

Structure

Alanine-histidine-lysine + copper

Available from PX-Labs

AHK-Cu — 50mg, 100mg

The Single-Amino-Acid Difference

The two compounds differ only in their first residue — glycine (GHK) versus alanine (AHK). Glycine is the smallest amino acid; alanine adds a methyl group. This minor structural difference is exactly what makes the pair useful for comparative study: researchers can examine how a single-residue substitution affects copper binding and peptide behavior, with the rest of the sequence held constant.

In Blends

GHK-Cu also appears as a component in multi-peptide research blends: GLOW (BPC-157 + GHK-Cu + TB-500) and KLOW (BPC-157 + GHK-Cu + TB-500 + KPV). These combine the copper peptide with other frequently studied compounds in a single vial.

Research Use Only

GHK-Cu and AHK-Cu are sold strictly for laboratory and scientific research. They are not intended for human or veterinary use. PX-Labs is a research chemical supplier, not a compounding pharmacy, and does not provide usage, dosing, or application guidance.