GHK-Cu powder is the freeze-dried (lyophilised) form of the copper peptide GHK-Cu, and it should look like a fine blue to blue-violet powder or cake sealed in a vial. If you are buying it for lab work, the main things to check are a batch-matched certificate of analysis with HPLC purity and mass-spec identity, a vial size that suits your experiment, sealed dry packaging and a supplier that does not make health claims.
For a general overview of how research peptides are packed, see our guide to peptide vials and peptide powder, including vial sizes, labels and an arrival checklist.
This buyer’s guide goes through each of those in plain English, along with the red flags worth knowing about. Everything here is for laboratory research use only.
What GHK-Cu powder actually is
GHK-Cu is a very small peptide made of three amino acids (glycine, histidine and lysine) holding a single copper ion. The NIH PubChem record for prezatide copper (GHK-Cu) gives the complex a molecular weight of about 403 g/mol. It was first found in human plasma, and Loren Pickart, who identified it, has written a useful review of the lab research since (Pickart and Margolina, 2018, International Journal of Molecular Sciences).
The powder is made by freeze-drying a solution of the peptide. Taking the water out this way keeps it far more stable than a liquid, which is why research peptides are nearly always sold as a dry powder for the lab to make up later.
What colour should GHK-Cu powder be?
Blue. The copper(II) ion is gripped by nitrogen atoms from the peptide, and that copper complex is what gives the powder and its solutions their colour. Researchers who worked out the structure describe the binding in detail (Hureau and colleagues, 2011, Chemistry: A European Journal).
That makes colour a handy first check when a vial arrives:
- Blue to blue-violet: what you would expect.
- Green or brown tints: worth asking about, as the copper complex may have changed.
- Almost white: plain GHK without its copper is not blue, so a very pale powder raises a question about what is actually in the vial.
- Wet-looking clumps or a sticky film: a sign that moisture has got in.
Colour is only an early warning, though. It does not replace proper testing.
Cake, fluff or pellet? What the powder looks like
Freeze-dried peptides do not all look the same. You might see a neat “cake” at the bottom of the vial, a loose fluffy powder, or a small shrunken pellet. A cake that has shrunk or broken up in transit is normal and is not a quality problem by itself. What matters is that it is dry, an even colour and sealed.
Research-grade vs cosmetic-grade GHK-Cu powder
Search for GHK-Cu powder and you will see two quite different things for sale, often side by side:
- Cosmetic raw material. Usually sold by the gram as “copper tripeptide-1” for skincare formulators. Testing paperwork varies a lot from seller to seller.
- Research-grade GHK-Cu. Sold in sealed milligram vials, each linked to a batch number and a certificate of analysis, and labelled for laboratory research.
It is the same molecule, but the two are not interchangeable. For lab work you need to know exactly which batch you have and what it was tested for, so the batch-linked paperwork is the whole point.
Choosing a vial size: 50 mg or 100 mg
GHK-Cu powder for research is commonly sold in 50 mg and 100 mg vials. Neither is “better”. Pick the one that fits your plan:
- Smaller vials suit pilot work, or experiments where you only make up a little at a time.
- Larger vials suit longer studies, as long as you can split and store the solution properly once it is made up.
Once you know your vial size and the volume of solvent you plan to add, our free peptide concentration calculator will work out the mg/mL for you. For the hands-on part, see our step-by-step guide on how to reconstitute GHK-Cu powder.
What the certificate of analysis should show
The COA is the most useful document you will get with GHK-Cu powder. At a minimum, look for:
- A batch number that matches the one on your vial.
- HPLC purity, ideally with the chromatogram rather than just a number.
- Mass spectrometry identity, showing the measured mass matches GHK-Cu.
- Net peptide content if it is given, since the powder can also hold counter-ions and a little water.
- The testing lab and a test date.
Our guide to reading a peptide certificate of analysis explains each line in more detail.
Red flags when buying GHK-Cu powder
- No COA at all, or one generic certificate reused for every batch.
- A claimed purity of exactly 100%, or a purity figure with no mass-spec identity.
- Listings that talk about dosing, injections or results in people. Research suppliers should not do this.
- Broken seals, loose caps or powder that is damp or clumped when it arrives.
- No batch number on the vial label.
Storing GHK-Cu powder once it arrives
Dry powder is fairly robust, but heat, light and moisture all wear it down over time. Keep vials sealed, dark and cold, and let a vial come up to room temperature before opening it so moisture does not condense on the powder. Our complete guide to storing research peptides covers fridge and freezer temperatures and shelf life in more depth. Once the powder is made up, our guide to what not to mix with copper peptides explains which buffers and additives destabilise the copper complex.
Where Peptides UK fits in
Our research-grade GHK-Cu powder comes in 50 mg and 100 mg vials of lyophilised powder, shipped from the UK. Every batch is HPLC & COA Verified, with a certificate showing HPLC purity and mass-spec identity, so you can check what you have before any lab work starts. Got a question about a batch? Email research@peptideslabuk.co.uk.
On UK rules: the MHRA decides whether a product counts as a medicine, and its guidance on borderline products explains how that works. We supply GHK-Cu as a research material only.
GHK-Cu powder FAQ
Is GHK-Cu powder the same as copper tripeptide-1?
Yes, it is the same molecule. Copper tripeptide-1 is the ingredient name used on cosmetic labels, while GHK-Cu is the name used in science. What can differ is the grade: how it is packed, tested and documented.
What colour should GHK-Cu powder be?
A blue to blue-violet powder or cake is normal. The colour comes from the copper held by the peptide. A green or brown tint, damp clumps or an almost white powder are worth questioning with the supplier before you use it.
Is 50 mg or 100 mg of GHK-Cu powder better?
Neither is better. Pick the size that matches how much material your experiment needs, so you are not making up more solution than you can use while it is fresh. Our peptide calculator can help with the concentration maths.
How should GHK-Cu powder arrive?
In a sealed vial with an intact cap and crimp, a clear label with the batch number, and paperwork or a download link for the matching certificate of analysis. Store it cold, dry and dark as soon as it arrives.
Can I buy GHK-Cu powder in the UK?
Yes, GHK-Cu is sold in the UK as a research chemical and as a cosmetic ingredient. The MHRA decides whether a particular product counts as a medicine. Peptides UK supplies GHK-Cu for laboratory research use only.
Is Peptides UK GHK-Cu powder for human use?
No. It is supplied for laboratory research use only. It is not for human or veterinary use, and it is not a cosmetic ingredient for making skincare at home.
For laboratory research use only. Not for human or veterinary use. This article is general lab and buying information, not medical advice.
