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, 100mg | $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 |
| 100 mg | 100 mg/mL248 mM | 50 mg/mL124 mM | 33.3 mg/mL82.5 mM | 20 mg/mL49.5 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. Before you order, the Lab Reports tab on the product page sends you the latest batch's report by email.
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 our Calgary, Toronto and Vancouver distribution centers, the same business day your e-Transfer clears, with a QR code on the vial that opens its independent, third-party lab 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.
Related articles
- Where to buy a peptide blend in CanadaPeptide blends are sold in Canada as research chemicals. What a blend vial holds, how to reconstitute one, and how to check what is inside it.
- DSIP in Canada: what's sold and how to check itDSIP is sold in Canada as a research chemical for lab use. Vial sizes, prices, how the rules apply, and how to check that a vial is really DSIP.
- KLOW vs KPV: a four-peptide blend and a tripeptideKLOW contains KPV as one of its four peptides, so they are not alternatives. What separates an 80 mg blend vial from a 10 mg KPV vial, and how each is checked.
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