Guide

GHK-Cu: reconstitution, the colour check and storage

GHK-Cu's numbers in one place: the copper complex, its mass, the 50 mg vial, concentration table and the colour check you can do yourself.

Published September 4, 2026

GHK-Cu is three amino acids holding a copper ion, and at 404 g/mol it is one of the smallest molecules we sell.

Peptide	Vial sizes	From
GHK-Cu	50mg	$24.99 CAD
GHK Basic	Single size	$56.99 CAD
GLOW BPC157 + TB500 + GHK-Cu Blend	70mg	$79.99 CAD
KPV + GHK-Cu Blend	10mg + 50mg	$53.99 CAD

Free shipping across Canada. Every vial ships with a QR code linking to its own batch lab report. See all peptides

Identity


Sequence	GHK (glycyl-histidyl-lysine), copper complex
Formula	C14H22CuN6O4
Molecular weight	403.91 g/mol
CAS	49557-75-7
Vial size we sell	50 mg

The histidine in the middle is the copper-binding residue. Take the copper away and you have GHK basic at 340.38 g/mol, which we also sell. GHK-Cu vs GHK basic covers the pair.

The colour check

This is the only product in the catalog where you can check something about identity without a lab. Reconstituted GHK-Cu is blue, because copper(II) absorbs in the red part of the spectrum. The copper-free peptide dissolves colourless.

That is not a purity test and it does not replace the report. But if a vial labelled GHK-Cu goes into solution clear and colourless, read its report before doing anything else.

Concentration

Vial	1 mL	2 mL	3 mL	5 mL
50 mg	50 mg/mL124 mM	25 mg/mL61.9 mM	16.7 mg/mL41.3 mM	10 mg/mL24.8 mM

GHK-Cu vial sizes we sell, at four diluent volumes. Molarity uses 403.91 g/mol. Other volumes

A 50 mg vial is about 124 micromoles, which is roughly a hundred times the molar content of a 5 mg vial of a large peptide. Small molecule, big number. The GHK-Cu calculator has the weight preset.

Handling

Water down the inside wall, swirl, never shake. Fifty milligrams is a lot of powder for a small vial, so give it a minute longer to dissolve than a 5 mg vial. Freezer for the dry powder; reconstituted, keep it refrigerated and out of light, because copper complexes are light-sensitive. Storage guide.

On the report

Observed mass near 403.91, HPLC purity at 99% or higher, matching batch number, named lab. Look up any batch.

In the blends

The copper form appears in GLOW, KLOW and the KPV + GHK-Cu blend. A blend's label mass is the combined content, and the report states the ratio for that batch. Peptide blends vs single vials covers the trade.

Every GHK-Cu vial from pepuro ships free, from Calgary, the same business day your e-Transfer clears, with a QR code on the vial that opens its Janoshik Analytical report.

For research use only. Not for human or animal consumption.

Frequently asked questions

What is the molecular weight of GHK-Cu?+

403.91 g/mol, formula C14H22CuN6O4. The copper-free tripeptide is 340.38, so the copper accounts for about 63.5.

Should reconstituted GHK-Cu be blue?+

Yes. Copper(II) complexes absorb red light, so the solution looks blue. A GHK-Cu vial that reconstitutes colourless is worth checking against its lab report.

How much water do I add to a 50 mg GHK-Cu vial?+

1 mL gives 50 mg/mL, 2 mL gives 25 mg/mL, 5 mL gives 10 mg/mL. At 403.91 g/mol, 50 mg is about 124 micromoles, the highest molar content in the catalog.

Does GHK-Cu need protection from light?+

Keep a reconstituted vial out of direct light. Copper complexes are light-sensitive, and the dry powder should be in the freezer for long-term storage anyway.

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