Copper coordination
is a chemistry problem,
not a catalogue SKU.
Cupratec is the atelier behind copper-bound peptide actives for cosmetic, dermatology, hair-scalp, and licensed mesotherapy programmes. Every lot leaves our bench with a UV-Vis spectrum, a measured Cu²⁺ : peptide molar ratio, and solution-stability data — because copper coordination is a chemistry problem, not a catalogue SKU.
UV-Vis · Illustrative GHK-Cu lot
GHK-Cu · Lot CT-26-A0517
CAS
89030-95-5
MW (complex)
401.91
Cu : Pep
1.00 ± 0.02
Per Lot
UV-Vis + Cu²⁺ ratio
g-scale
Atelier batches
<12h
Response
The Cupratec Atelier Promise — On Every Lot
Inside the Atelier · Two Actives
The library is two molecules deep — on purpose.
Cupratec carries only the copper-peptide actives whose coordination chemistry we have fully characterised. Two molecules, each with its own per-lot UV-Vis spectrum and measured Cu²⁺ : peptide ratio.
Active · Cu(II) tripeptide
Dermal · anti-ageingGHK-Cu
Copper Tripeptide-1 · the textbook copper-bound tripeptide
CAS 89030-95-5 · MW 401.91 · Purity ≥ 99.0%
The reference Cu(II)-tripeptide complex — Gly-His-Lys coordinated 1:1 to a divalent copper ion through the histidine imidazole and two backbone amides, forming the square-planar tetraamine field that gives the powder its diagnostic blue. Cupratec releases GHK-Cu only when the lot has cleared its UV-Vis spectrum, Cu²⁺ : peptide ratio, and 6-month solution-stability data — the same packet that travels with the vial.
Active · Cu(II) tripeptide
Hair · scalpAHK-Cu
Copper-bound Ala-His-Lys · pitched at hair-follicle and scalp programmes
Sequence AHK · 1:1 Cu²⁺ complex · Purity ≥ 99.0%
The structural analog to GHK-Cu, with the N-terminal glycine swapped for alanine — the substitution shifts affinity toward follicular and scalp tissue, which is why AHK-Cu lands in hair-regrowth and scalp-serum formulations rather than the dermal-repair indications. Same atelier discipline: every lot ships with its UV-Vis trace, measured Cu²⁺ ratio, and a stability dataset against the master lot.
The library is intentionally small — only the actives whose copper coordination chemistry Cupratec has fully characterised. Need a custom Cu-peptide outside the library? See Custom Cu-Peptide Service
Inside the Atelier
Two molecules deep. Three ways to work with us.
Beyond the two characterised actives, Cupratec runs an atelier of method, custom synthesis, and editorial — pick the doorway that matches what your formulation programme needs next.
The Craft
How we coordinate the copper, hold the complex through purification, and prove it on every single lot — the atelier methodology behind the two actives.
Custom Cu-Peptide
Need a Cu-peptide that isn't GHK-Cu or AHK-Cu? Biotinylated GHK-Cu, palmitoyl GHK-Cu, brand-spec AHK/GHK blends, Cu-Glutathione — gram-scale and up, same per-lot characterisation discipline.
Field Notes
Editorial briefs for formulators — why the Cu²⁺ ratio matters, how to read a Cu-peptide UV-Vis spectrum, formulation guardrails for the working window.
Lot-release bench · captured during a production day
Lot Data, on Every Lot
The numbers verify the chemistry.
A GHK-Cu lot without a UV-Vis spectrum is just a blue powder. Every Cupratec lot ships with the characterisation data formulators actually need — and the analytical packet behind it on request.
≈622 nm
λmax · Cu(II) d-d band
ΔE < 1.0
Color vs. master lot
6-month
Solution stability data
UV-Vis spectrum on every lot — λmax position and absorbance at brand-relevant wavelengths, the diagnostic for intact Cu(II) coordination.
Cu²⁺ : peptide molar ratio by ICP-MS or atomic absorption, target with documented tolerance — never assumed from synthesis stoichiometry.
Solution stability + color ΔE, tracked through 6 months at 25 / 40 / 60 °C against an in-house master-lot reference.
Field Notes
Editorial briefs, written at the bench.
Short, chemistry-literate pieces for formulators who already know what GHK-Cu is and need to know how to read its lot data.
Published May 20, 2026
4 min read
Why Cu²⁺ : Peptide Ratio Matters — A 90-Second Quality Check for Formulators
Two GHK-Cu lots can have the same peptide content on HPLC and still behave differently in your serum. The molar ratio is what separates them — here is how to read it at receipt, without leaving the bench.
Read the Field Note
From the Atelier
Sample a Cupratec lot.
First response under 12 hours. We send a 25 g sample of the active you specify, the lot's UV-Vis spectrum, the Cu²⁺ : peptide ratio measurement, and a feasibility note for the formulation application you have in mind.