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Compound guide
AHK-Cu: what the research covers
A copper-binding tripeptide, like GHK-Cu but with a different sequence and a different reported emphasis. The copper is not an additive; it is part of the molecule.
What AHK-Cu is
AHK-Cu is alanyl-histidyl-lysine with a bound copper(II) ion. The histidine imidazole and the backbone nitrogens form the coordination site, and the resulting complex is a defined chemical entity rather than a peptide with copper added alongside it — the metal is held in a specific geometry and the complex behaves differently from either component alone.
It is the structural sibling of GHK-Cu, which is glycyl-histidyl-lysine with copper. One residue differs. That is a small change chemically and a meaningful one biologically: the two complexes have different stability constants, different redox behaviour and, in the published work, different emphases.
Copper itself is the functional reason these peptides exist. It is a required cofactor for lysyl oxidase, which cross-links collagen and elastin, and for superoxide dismutase, and the peptide component is essentially a delivery and buffering system that presents copper in a controlled form.
Where the literature diverges from GHK-Cu
GHK-Cu has the larger body of work and it is centred on dermal remodelling: collagen synthesis, wound closure, gene expression in fibroblasts. AHK-Cu work concentrates instead on the hair follicle — dermal papilla cell proliferation, vascular endothelial growth factor expression, and follicle size and growth phase in culture and in animal models.
Whether that difference reflects genuinely distinct biology or simply where each compound happened to be studied is not fully resolved, and it is a reasonable question for a comparative design to address. The pairing is set out on GHK-Cu versus AHK-Cu.
One methodological caution applies to both. Copper complexes participate in redox chemistry, and in a culture system that can produce effects — reactive oxygen generation, interference with assays that involve metal-sensitive reagents — which have nothing to do with the peptide. Copper-only controls are the standard precaution.
How Amino Club supplies it
Supplied lyophilised in sealed vials as AHK-Cu, specified at 99% purity or better by HPLC with identity confirmed by mass spectrometry and released against the batch Certificate of Analysis; the lab testing page documents how that is done.
The copper complex gives the powder its characteristic blue colour, and that colour is a useful informal indicator: a preparation that is white has not formed the complex. Solutions are light-sensitive and pH-sensitive, since the coordination depends on the protonation state of the histidine, so laboratories keep them cold, dark and buffered within the range the work requires. The sealed vial is stored below −18 °C. Diluents are under reconstitution supplies.
Related reading
AHK-Cu belongs to the skin and cosmetic research peptides group with GHK-Cu, SNAP-8, Melanotan I, Melanotan II and glutathione. The direct comparison is GHK-Cu versus AHK-Cu.
Every guide is indexed in the research library. Certificates and storage are covered on the FAQ, quantity pricing through bulk and wholesale.
Research use only
AHK-Cu supplied by Amino Club is a laboratory reference material. It is not a medicine, not a supplement, and not for human or veterinary use, and no dosing guidance or administration protocol is provided. The full terms are in the research use policy.