GHK-Cu 50mg (Copper Peptide)

GHK-Cu 50mg Copper Tripeptide Complex

GHK-Cu is the copper(II) complex of the tripeptide glycyl-L-histidyl-L-lysine. The free tripeptide was first described in human plasma in the early 1970s. In the presence of copper(II) it forms a stable coordination complex, and that complex is what we supply here, not the free peptide. The copper is what gives the lyophilised solid its blue colour.

Identity and specification

• Product name: GHK-Cu 50mg (Copper Peptide)
• Synonyms: Copper tripeptide-1, Prezatide copper, Cu-GHK, GHK copper
• CAS number (copper complex): 89030-95-5
• CAS number of the free tripeptide, for reference: 49557-75-7 (not the identifier for this product)
• PubChem CID: 165429100 for the neutral 1:1 complex, 71587328 for prezatide copper
• Molecular formula: C14H22CuN6O4 (neutral 1:1 complex)
• Molecular weight: 401.9 g/mol. The free tripeptide is 340.38 g/mol
• Peptide sequence: Gly-His-Lys
• Catalogue number: GHK-023
• Unit: 1 vial, 50mg
• Form: Lyophilised solid
• Purity: >99% by HPLC

Which identifier is correct, and why it matters

GHK and GHK-Cu get conflated across this market, including in supplier listings. They are two different materials. The free tripeptide carries CAS 49557-75-7 and a molecular weight of 340.38. The copper complex carries CAS 89030-95-5 and a molecular weight of roughly 402.

PubChem catalogues the complex in more than one form. The neutral 1:1 complex sits at 401.91, a cationic form at 402.92, and a 2:1 species at 744.3. Quoted masses therefore vary a little between sources depending on which is being described. What does not vary is the difference between complexed and uncomplexed material. Before comparing listings on mass or on price per milligram, confirm which of the two a supplier is quoting.

Appearance and batch colour variation

Colour ranges from deep blue to a lighter blue between batches. This is normal. It comes down to synthesis route, water content and storage conditions, and it is not an indicator of purity. We have supplied this compound for many years and the variation has been consistent across that period. Purity is measured by HPLC rather than inferred from how the vial looks.

Storage and stability

Supplied lyophilised. Store the sealed vial at -20°C, protected from light and moisture. Lyophilised material is the stable presentation. Once in solution, stability drops and is affected by temperature, light and the solvent used. Copper complexes are also sensitive to chelating agents and to strongly acidic or alkaline conditions, so buffer selection matters here in a way it does not for uncomplexed peptides. All handling and laboratory procedures are determined by the receiving laboratory under its own protocols.

Synthesis and quality control

Synthesised under controlled conditions and tested per batch. Identity and purity are established by reverse-phase HPLC. A purity figure quoted without a stated method is not comparable between suppliers, because the number depends on how it was measured.

Legal and safety information

UK Peptides supplies GHK-Cu strictly as a laboratory research chemical. It is not a medicine. It is not for human or veterinary use, and it is not for use in food or cosmetics. We do not provide preparation, handling or usage guidance, and we are unable to answer enquiries relating to human consumption.

Related pages

• GHK-Cu, the copper tripeptide explained
• Sourcing GHK-Cu in the UK, and what to check first
• PAL-GHK 10mg

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Why Choose UK Peptides for GHK-Cu 50mg (Copper Peptide) in the UK?

UK Peptides has supplied research-grade peptides to the UK scientific community since 2012. We work directly with our manufacturing partner rather than through third-party resellers, so every batch of GHK-Cu 50mg (Copper Peptide) is tested before it reaches your freezer, and consistency carries from one order to the next. Orders placed before 3pm are dispatched the same day, with tracked next-day delivery available across the UK.

Reconstitution in a Research Setting:

As a lyophilised peptide, GHK-Cu 50mg (Copper Peptide) is typically reconstituted immediately before use by adding sterile or bacteriostatic water directly to the vial, rather than by vigorous mixing, to protect the peptide's structure. The exact diluent, volume, and resulting concentration are decisions for the receiving laboratory's own protocols and intended assay. Once reconstituted, peptides are generally less stable than in lyophilised form and are best used promptly or kept refrigerated for short-term storage only, again under the receiving laboratory's own procedures.

Frequently Asked Questions

Is GHK-Cu 50mg (Copper Peptide) intended for human use?
No. It is sold strictly for in-vitro laboratory research and is not a medicine, supplement, or food product.

What form does GHK-Cu 50mg (Copper Peptide) ship in?
As a sealed, lyophilised (freeze-dried) vial, the standard form for stable storage and transport of research peptides.

What purity standard does this batch meet?
See the specification list above for this product's confirmed purity and batch details.

Quality Control at Every Batch:

Every batch of GHK-Cu 50mg (Copper Peptide) that reaches our freezer has already been through our manufacturing partner's own analytical verification before dispatch, checking identity and purity against the specification shown above. Peptides are inherently sensitive to heat, light, and moisture, so batches are kept in temperature-controlled storage from the point they arrive with us until they are picked, packed, and dispatched — the same cold-chain discipline we ask researchers to continue once a vial reaches their own laboratory.

Does this come with a Certificate of Analysis?
Where a Safety Data Sheet or Certificate of Analysis is available for GHK-Cu 50mg (Copper Peptide), it can be accessed from this product page; see the Safety Data Sheet tab above if present for this item.

Explore More Research Peptides:

GHK-Cu 50mg (Copper Peptide) is one entry in our full peptide catalogue, alongside related compounds such as Epitalon 10mg. Researchers cross-referencing compound data for their own records may also find the NCBI PubChem database, a free public compound reference maintained by the US National Library of Medicine, a useful independent source alongside the specification listed above.