GHK-Cu Copper Peptide

This page covers every GHK-Cu size we stock: 50mg and 100mg vials of freeze-dried peptide, a copper-binding tripeptide. It’s meant for lab and analytical work only.

GHK-Cu lab testing

Every the peptide batch we list has a Freedom Diagnostics report behind it. The lab measures purity by HPLC and confirms identity by mass spectrometry, and you can open the full reports in the photo gallery on this page.

• GHK-Cu 50mg: 99.578% purity, reported 2/28/2026, search code ONYX2602270069
• GHK-Cu 100mg: 99.778% purity, reported 3/12/2026, search code ONYX2603110095
• GHK-Cu 100mg: 99.95% purity, reported 8/13/2025, search code onyx2508120023

Want to verify it? Each search code above opens the original report on the Freedom Diagnostics site. The best figure on file is 99.95%.

GHK-Cu background

GHK-Cu is the tripeptide glycyl-L-histidyl-L-lysine bound to a copper(II) ion. Loren Pickart first isolated GHK from human plasma in 1973, and levels in plasma are reported to fall with age.

It binds copper tightly and is studied for wound healing, collagen production and skin repair. It’s also one of the most common actives in copper peptide skin care.

Mechanism of action

GHK binds copper tightly and can deliver it to cells. Copper is a cofactor for lysyl oxidase, the enzyme that cross-links collagen and elastin, and for antioxidant enzymes.

In cell and animal studies the peptide increased collagen and glycosaminoglycan production, attracted repair cells to wounds, and changed the activity of many genes involved in tissue remodeling.

Key details

• Compound: GHK-Cu
• Also known as: copper peptide, prezatide copper
• CAS number: 49557-75-7
• Structure: Gly-His-Lys bound to copper(II)
• Sizes: 50mg, 100mg
• Form: lyophilized (freeze-dried) powder in a crimp-sealed glass vial
• SKU: ONYX-GHKCU
• Use: laboratory research only

What the research reports

Maquart and colleagues reported in 1988 that the peptide stimulated collagen synthesis in cultured fibroblasts, and later rat wound-chamber studies found more collagen and glycosaminoglycan buildup.

Gene expression work by Pickart and colleagues suggests GHK can shift the activity of a large number of human genes, many tied to tissue repair and the antioxidant response.

You can read the original papers through this PubMed search for GHK-Cu, a free database from the U.S. National Library of Medicine.

Similar research compounds

Short version: GHK-Cu is a copper-binding tripeptide tied to collagen and tissue remodeling. Labs often weigh it against these:

• Melanotan 2 is a cyclic melanocortin agonist studied for pigmentation

Skin research splits into copper peptide remodeling, pigment work with melanocortins and antioxidant studies. Every one of them is in stock in our skin and tanning peptides.

Checking your vials

Each vial carries the black and white Onyx Research label with the compound, the amount, 99% purity and the research-use line. Check that the name and amount match your order and that the cap and crimp are tight.

The powder should look dry and pale, either as a solid cake or loose granules. If the cake has crumbled in the box, that’s expected. Powder that looks wet, gummy or off-color is not, so keep that vial out of use and send us a photo.

Log the date the vial arrived and, later, when and how you mixed it. It’s quick, and it saves a lot of guesswork if something goes wrong.

GHK-Cu dilution chart

Concentration is simple division: the 50mg in the vial over the volume of water you add. Here’s the 50mg vial at three common volumes:

• Add 2mL: 25mg/mL (2,500mcg per 0.1mL, or 10 units on a U-100 syringe)
• Add 3mL: 16.67mg/mL (1,666.7mcg per 0.1mL, or 10 units on a U-100 syringe)
• Add 5mL: 10mg/mL (1,000mcg per 0.1mL, or 10 units on a U-100 syringe)

Use bacteriostatic water, added slowly down the inside of the vial. Swirl, don’t shake. If some powder sticks to the glass, rest the vial in the fridge for a few minutes and swirl again.

Keeping the vial stable

Two rules cover the peptide storage: powder in the freezer, solution in the fridge. Keep both away from light and damp, since those break freeze-dried peptides down fastest.

Let a frozen vial come up to room temperature before you open it, or condensation forms on the powder.

Options and prices

Both options are on this page. Choose one from the option menu above the cart button:

• 50mg: $42.50
• 100mg: $57.50

The 100mg size works out cheapest per milligram, at about $0.57 per mg against $0.85 for the 50mg. The small vial is the better pick for a pilot run.

Related products

• GLOW Blend 70mg (GHK-Cu, BPC-157, TB-500): GHK-Cu, BPC-157 and TB-500 in one vial
• Melanotan 2 (MT-2), a melanocortin agonist
• KLOW Blend 80mg (GHK-Cu, KPV, BPC-157, TB-500): GHK-Cu, KPV, BPC-157 and TB-500 in one vial
• Epitalon 10mg (Epithalon), a tetrapeptide
• NAD+ 500mg, a coenzyme

The rest of the range sits in our skin and tanning peptides and anti-aging peptides. The Onyx Research home page links to all of it.

Questions people ask

How much is in each vial?

50mg and 100mg, depending on the size you pick.

Is it for human use?

No. It’s a research material only, with no approval for human or veterinary use.

Is it in stock?

Yes. All options listed here are ready to ship.

Is there a crypto discount?

Yes. Pay with cryptocurrency at checkout and an extra discount comes off your order.

Do you charge for shipping?

No. Shipping is free on every order, and we ship worldwide.

Order GHK-Cu online

Order GHK-Cu now from from $42.50. It’s in stock, and shipping is free on every order.

Paying with crypto? Choose it at checkout for an extra discount on the whole order.

Building a larger order? See what else is in our skin and tanning peptides and anti-aging peptides.

Research use only. Onyx Research supplies this material to qualified labs for in-vitro work. It’s not a medicine, supplement, food or cosmetic, and it must not be given to people or animals. No statement here has been reviewed by the FDA.