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Skin & melanocortin research peptides

AHK-Cu — sequence, sources and suppliers

Copper(II) complex of the tripeptide Ala-His-Lys. A 2007 in-vitro study reported AHK-Cu promoted human hair follicle elongation.

Skin & MelanocortinCAS 126828-32-83 residuesCopper tripeptide-3Updated 2026-11-09
Original illustration for AHK-Cu research notes: abstract molecular artwork in orange and teal
Original illustration by USA Peptide Vendors; artistic, not a structural model.

At a glance

Amino acid sequence · 3 residues
  1. A1
  2. H2
  3. K3
CAS number
126828-32-8
Molecular formula
C15H26N6O4
Molecular weight
354.41 g/mol
PubChem CID
7408502
Length
3 residues

Values are for the AHK peptide itself; the copper complex adds one Cu(II) ion.

Verified 2026-11-09 against PubChem CID 7408502. Values we couldn't verify are left out.

What the literature covers

A 2007 in-vitro study reported AHK-Cu promoted human hair follicle elongation. Purgo sells a 100mg vial.

Proposed AHK-Cu signaling

Evidence level: Limited: a single in-vitro study. All mechanism maps

AHK-Cu mechanism diagramReported hair-follicle effects in one in-vitro study. Targets: Dermal papilla cells. Reported in culture: Proliferation ↑ → Apoptosis ↓. Effect reported: Hair follicle elongation.AHK-Cu mechanism mapReported hair-follicle effects in one in-vitro studyAHK-Cucopper tripeptideDermal papilla cellshuman [1]Proliferation ↑[1]Apoptosis ↓[1]Hair follicle elongationex vivo [1]Evidence: Limited: a single in-vitro study. Numbers in brackets refer to the cited sources.usapeptidevendors.com · Research Use OnlyCELLS STUDIEDREPORTED IN CULTUREEFFECT REPORTED
One study, not replicated at scale. No receptor identified. Open SVG
  1. Pyo HK et al. The effect of tripeptide-copper complex on human hair growth in vitro. Arch Pharm Res. 2007;30:834-9.

Before you order

  • Match the CAS number on the certificate to 126828-32-8.
  • A 3-residue peptide should show a mass-spec identity near 354.41 g/mol; HPLC purity alone doesn't confirm identity.

FAQ

What is AHK-Cu?

Copper(II) complex of the tripeptide Ala-His-Lys. A 2007 in-vitro study reported AHK-Cu promoted human hair follicle elongation. Purgo sells a 100mg vial.

What are AHK-Cu's CAS number and molecular weight?

CAS 126828-32-8, formula C15H26N6O4, 354.41 g/mol, per PubChem CID 7408502. Values are for the AHK peptide itself; the copper complex adds one Cu(II) ion.

Where can US labs buy AHK-Cu?

Purgo Labs stocks it as “AHK-CU”; code usapeptidevendors takes 25% off at checkout. This page also lists the best-documented second vendor from our 112-vendor directory.

Is research-grade AHK-Cu for human use?

No. Vendor material is sold for Research Use Only, not for human or veterinary use.