GHK-Cu
A naturally occurring copper tripeptide that signals skin to rebuild. People run it for collagen, firmer skin, and hair, usually as a topical serum, sometimes injected subcutaneously for whole-body skin and tissue support.
Where to buy GHK-Cu, cheapest first.
Prices from 8 vendors across the market. We link straight to each vendor’s product page and grade vendors on public lab data, so you’re not just chasing the lowest number.
GHK-Cu
What GHK-Cu actually does.
The simple version first, then a little more for the curious. No biochem degree required.
It tells skin cells to act young again, switching on collagen and elastin production and helping damaged tissue remodel, so skin looks firmer and heals better.
How it works
GHK-Cu is a tripeptide (glycine-histidine-lysine) bound to a copper ion. The copper acts as a cofactor for the enzymes that crosslink collagen, while the peptide signals fibroblasts to ramp up collagen, elastin, and glycosaminoglycan production.
Where it acts
Applied topically it penetrates into the upper skin layers where fibroblasts live and remodel the matrix. On the scalp it supports the hair follicle and is studied for blocking some DHT activity. Injected, it works more body-wide.
What people notice
People report smoother texture and better hydration within a few weeks, with firmness and tone building over a couple of months. It is one of the more human-studied cosmetic peptides, so expectations here are a bit more grounded than most.
Honest caveat: the strongest evidence is cosmetic, on topical formulations for skin appearance. The injectable, systemic claims rest mostly on lab and animal work. It is not an approved medicine in injectable form and is sold strictly for research use only. None of this is medical advice, talk to a licensed provider before starting anything.
How to take it.
GHK-Cu is most commonly applied topically as a serum or cream to clean skin or scalp, no needles or mixing. Some people inject it subcutaneously for whole-body skin and tissue support, but topical is the simplest and best-evidenced route. The routine is below; for cycling and the injectable option, see the full guide.
Clean the area
Wash and pat dry the skin or scalp first. GHK-Cu absorbs best into clean skin, with no leftover oils, makeup, or other actives sitting on top.
Apply the serum
Smooth a thin layer of GHK-Cu serum or cream (a typical cosmetic strength is around 1–2%) over the area. A few drops or a pea-sized amount is plenty; use the same amount each time.
Let it absorb
Give it a few minutes to sink in before layering anything else. Avoid pairing it directly with strong acids or vitamin C in the same step, which can disrupt the copper.
Stay consistent
Use it once or twice daily. Effects build over weeks. Store the serum cool and out of direct light, and keep any reconstituted injectable vial in the fridge.
Typical GHK-Cu dose: topically, a serum or cream at roughly 1–2% applied once or twice daily to clean skin or scalp. Injected, people run about 1–2 mg subcutaneously, 2 to 3 times a week, in 8 to 12 week cycles. Effects build over weeks.
How to cycle GHK-Cu.
How long people run GHK-Cu, when to take a break, and the honest reasoning behind it.
Injected in cycles; effects build over weeks.
A cycle just means a defined run of time on the peptide, followed by a break. Topical GHK-Cu is gentle enough that many people use it ongoing as part of a skincare routine. The injectable form is usually run in cycles of roughly 8 to 12 weeks, then a 4 to 6 week break, rather than continuously.
Why not just run the injectable forever? Mostly because the long-term human safety data does not exist yet. The cautious and widely followed approach is to run a focused block, then stop and reassess.
- Topical can be steady, used once or twice daily as an ongoing part of your routine.
- Injectable runs in blocks, roughly 8 to 12 weeks on, then a break, rather than indefinitely.
- Take a real break after an injectable cycle before considering another. If you are unsure, that is a conversation for a licensed provider.
Want the full picture, on and off periods, the washout, stacking, and keeping your results? Read how peptide cycling works →
What's actually in the vial.
For 5 of these vendors we link the per-batch certificate itself (a specific lab report, COA PDF, or certificate image), and the purity below is read straight off that certificate. The rest link to the vendor's general lab-results page. We don't run the labs ourselves and we don't show a purity number unless it's printed on a certificate we link, so you can open the document and check it against the batch yourself.
| Vendor | Purity (per COA) | Batch / report | Certificate |
|---|---|---|---|
| EZ Peptides | 99.699% | EZP-GHK5005072026-14 | Janoshik report ↗ |
| Swiss Chems | 99.991% | not shown | View COA ↗ |
| Onyx Biolabs | 99.978% | GHK0925-100-1 | View COA ↗ |
| BioLongevity Labs | 99.71% | 11-3-46136 | View COA ↗ |
| Midwest Peptide | see COA | 1778007737141 | View COA ↗ |
| Next Gen Peptides | see lab page | not shown | Lab results ↗ |
| Penguin Peptides | see lab page | not shown | Lab results ↗ |
What people pair it with.
GHK-Cu is the copper-peptide piece people add when skin and appearance are part of the goal, not just internal repair.
Skin & recovery
The repair stack people run for skin as well as tissue. GHK-Cu adds the copper-peptide angle for skin and collagen on top of the BPC-157 and TB-500 healing base.
View stack →Full recovery cascade
The all-in-one healing blend. GHK-Cu covers skin and collagen, KPV calms inflammation, and BPC-157 with TB-500 handle tissue and tendon repair. The everything-at-once protocol.
View stack →Topical pairing
A topical copper-peptide duo. GHK-Cu leads on collagen and skin firmness; AHK-Cu is added by people focused on the hair-follicle and scalp side.
View stack →In the same corner.
Other healing and skin peptides people compare against GHK-Cu.
Questions, answered straight.
Is GHK-Cu legal?
GHK-Cu is widely sold and used in cosmetic, topical skincare. The injectable form is a different story: it is not an approved medicine, and the vendors we compare offer it strictly for research use only. Like other peptides in its class it is covered by WADA's prohibited-substance language, so competing athletes should be cautious. Rules vary by country, so check what applies where you are.
What does research use only actually mean?
It means the injectable product is sold for laboratory and research purposes, not as a supplement or medicine for people. It has not been reviewed or approved for human injection by the FDA. We aggregate prices and public lab data so you can see the landscape; what you do with that is between you and a licensed provider.
Topical or injected, which should I use?
For skin appearance, the topical serum or cream is the simplest route and has the strongest human evidence, so most people start there. The subcutaneous injection is what people reach for when they want whole-body skin and tissue support rather than a localized cosmetic effect. Topical does not need mixing or needles.
How do I store it?
Keep a topical serum cool and out of direct light, and follow its label. For the injectable, keep the sealed freeze-dried vial in the fridge and out of light; once mixed with bacteriostatic water, store it refrigerated and use it within about a month. Do not freeze a reconstituted vial.
Can I use it with vitamin C or acids?
Best not in the same step. Strong acids and high-dose vitamin C can disrupt the copper that makes GHK-Cu work, so many people use GHK-Cu at a separate time of day, for example acids in the morning and GHK-Cu at night.