AHK-Cu

AHK-Cu belongs to the same small family of copper-binding tripeptides as GHK-Cu. The histidine residue in the second position provides the imidazole nitrogen that anchors copper(II), and the lysine tail contributes the positive charge that dominates the peptide's behaviour in chromatography and in formulation work.

The substitution of alanine for glycine adds a single methyl group. That is a small change in mass but not a trivial one chemically: it alters the conformational freedom of the backbone near the metal-binding site, which is precisely why the two peptides are interesting to compare rather than interchangeable.

AHK-Cu appears less frequently in the indexed literature than GHK-Cu, and the work that exists concentrates on cosmetic-science model systems — dermal papilla cells, follicular culture models, and matrix protein expression panels. As with GHK-Cu, these are cell-culture systems and their results do not transfer to human outcomes.

Because the two peptides differ by one residue, a recurring theme in the literature is comparative: does the substitution change copper affinity, stability, or the transcriptional profile observed in a given cell type? Laboratories running that comparison need independent, lot-specific documentation for each material, which is how VaultLabs catalogs them.

Laboratories almost never buy AHK-Cu in isolation. It is usually ordered as the comparator arm of a study whose primary subject is GHK-Cu, which makes the integrity of the comparison the thing that matters most about the purchase.

Three practical points follow from that. First, both materials should come from documented lots with independent certificates, so a result can be attributed to the compound rather than to an unquantified difference between batches. Second, the two peptides behave similarly enough in reversed-phase chromatography that a method resolving one will usually resolve the other, which simplifies parallel analysis but also means cross-contamination would not be obvious. Third, copper content should be treated as a variable in its own right rather than assumed equal across two different complexes.

Where a study reports a difference between the two peptides, the useful question for a reviewer is whether the difference reflects the alanine substitution or the material. Good lot documentation is what allows that question to be answered.

Release testing is by reversed-phase HPLC against the stated purity specification, with the resulting certificate linked to the lot number on the vial. As with any copper peptide, purity by HPLC describes the peptide component and does not by itself evidence copper stoichiometry; add a confirmatory method if your protocol depends on the intact complex.

Store sealed lyophilised vials at 2–8 °C away from light and moisture, and equilibrate to room temperature before opening. After reconstitution, treat the solution as a metal complex: avoid chelating buffer components, prepare close to the point of use, and log reconstitution date, diluent and thaw cycles.

Copper complexes are also sensitive to the composition of the buffer they end up in. Phosphate and citrate systems, and any component with appreciable metal affinity, can compete for the copper and quietly change what is actually present in the well. Where the identity of the complex matters to the readout, the buffer is part of the experimental design rather than a neutral background.

AHK-Cu is supplied as a research reference material. It is not registered as a medicine in the United Arab Emirates and is not supplied for human or veterinary use. The research-use declaration recorded at checkout forms part of the order documentation.

The catalog presentation is a 100 mg lyophilised vial held under controlled cold storage before dispatch. Laboratories running copper-peptide comparisons typically order AHK-Cu alongside GHK-Cu so that both arrive with certificates from the same supply chain.

Comparative copper peptide assays

Collagen-related marker panels

Keratinocyte culture models

2–8 °C (lyophilized, sealed)

2–8 °C sealed lyophilized storage.

Same handling principles as GHK-Cu — sealed cold storage, minimal moisture exposure.