GHK-Cu_
Also known as copper peptide, copper tripeptide-1, GHK copper
A copper skincare peptide for smoother, firmer, younger-looking skin.
Common vial size is what vendors typically sell, not a recommendation. Enter your own vial in the calculator.
What is GHK-Cu?
Plain language first. The technical label stays, but it never stands alone.Overview
GHK-Cu is a natural copper-binding tripeptide (glycyl-histidyl-lysine plus copper) the body uses in tissue repair, and levels fall with age. In plain terms: applied to skin it signals collagen and healing, which is why it is a popular anti-aging skincare ingredient.
What it's used for
A skincare peptide used to smooth fine lines, fade dark spots, firm skin, and speed wound healing by boosting collagen. It is basically anti-aging for your skin.
How does GHK-Cu work?
What it does in the body, and where.GHK-Cu is three amino acids bound to a copper atom. Your body makes it, levels fall sharply with age, and the copper is doing much of the work.
- 01It carries copper into skin cellsCopper is required by the enzymes that build collagen and elastin, and this peptide is how the body delivers it.
- 02Collagen production risesThe measurable effect in skin studies, along with faster closure of small wounds.
- 03Applied to skin, not injected, for most usesThe cosmetic evidence is for topical use. Injected use is off-label and much less studied.
Where this compound is thought to act.
What else is it used for?
Each group carries its own evidence level.Approved means regulators have cleared it for that purpose. Investigational means it is in trials. Early research means it is being studied and is not established.
Skin and wrinkles
Early research- Human trialOver 12 weeks, a copper-peptide serum reduced wrinkle volume by 55.8% and wrinkle depth by 32.8% against a control serum.
- Human trialIt reduced wrinkle volume 31.6% more than a leading peptide comparator.
- Human trialIn 21 women measured by ultrasound, skin collagen density rose about 28% on average over three months, and near 51% in the top quarter.
Wound healing and gene activity
Research only- Animal studyWound-healing activity is documented across multiple animal studies.
- Lab studyIn gene-expression analyses it shifts the activity of more than 4,000 human genes, though this is lab work rather than proof of anti-aging in people.
- No dataThe strong safety record applies to topical use. Injectable forms do not have this evidence behind them.
Some frequently cited recent trial figures on vendor sites could not be verified against published literature. The solid evidence is topical, not injectable.
How much, and do you cycle it?
The range, and whether you take breaks.Topical serum, 1-2 pumps, daily. Not cycledCommunity practice
Used daily as part of a routine. The effect depends on continued use and returns to baseline when you stop, so there is nothing to cycle off.
How do I dose and price it?
Enter your vial and your dose. Pick a mix. We show the draw and the cost.The vial holds a fixed amount of drug. Adding more water does not make more drug, it just spreads it thinner, so you draw a bigger number on the syringe for the same dose.
Choose your mix
Measuring the water1 mL = one full 100-unit syringe.
Your draw
4 / 100 unitsHow do you store it?
Before mixing, and after.Room temperature, out of light. Cap it tight after each use.
GHK-Cu ships as a cream, gel, or serum. Keep it at room temperature away from sun and heat unless the label says otherwise. Refrigerating an emulsion can split the texture. Watch for color, smell, or separation changes and stop using it if any appear.
What are the side effects and cautions?
Known cautions and warnings for this compound.22 July 2026Topical GHK-Cu is permitted in pharmacy compounding. The injectable form was listed in 2023 as possibly presenting significant safety risks, and that nomination was withdrawn in April 2026.
Stings a little going in, and that is normal. Inject slowly into a fattier area to ease it.
Community notes: what actually helps
What actually helps, according to the people doing it
Nobody's running trials on this. What follows is the folk wisdom that keeps surfacing in Reddit, peptide forums, and the Discord groups, sorted from "probably real" to "someone swears by it." Keep in mind, NONE of this is doctor advice.
The tip that comes up most on r/peptides is to add more water. Mix your vial with 3 or 4mL of bac water instead of 1 to 2mL. Same dose, spread thinner, so your skin reacts less.
- Let it warm to room temperature. Cold stings more.
- Let the alcohol dry fully before the needle goes in.
- Inject slow, over five to ten seconds.
- Move your spot around, at least an inch from last time.
- For a hard lump, warm compress after. For a red itchy welt, ice.
This is where Benadryl and Zyrtec come up constantly on the boards. Most people take one 30 to 60 minutes before the shot if they know they tend to react. Claritin works too. Some skip the pill and use Benadryl cream before, or hydrocortisone cream after. Quercetin gets mentioned a lot as the gentler, natural option.
One heads up you'll also see repeated: taking an allergy pill before every shot can hide a real allergy building underneath. That's why some people don't do it by default.
In the more advanced threads, people keep KPV around and inject it when a reaction flares, and say it clears fast. Others try low-dose naltrexone (LDN) as a longer-term fix, but that's real experimenter territory. And a common reminder on the forums: if your reactions are suddenly bad or started with a new vial, the peptide itself might be the problem, not you.
Redness that spreads past a couple inches, streaks, feels hot, oozes, or comes with a fever means a possible infection. See a doctor. Hives all over, a swollen face or throat, or trouble breathing is a real allergic reaction. Act on that right away.
Who should avoid it
- A known copper allergy or metal sensitivity, so patch test first
- Broken or actively irritated skin
- Layering with strong acids or retinoids on the same area
Stop and get help
- A spreading rash or significant swelling where applied
Common effects
- Mild, temporary skin irritation, redness, or itching
- Among the least irritating copper compounds in comparison studies
- The good safety record applies to topical use. Injectable and oral forms lack this database
Where this page says nothing is established, that means nobody has studied it, not that a compound is safe.
Is GHK-Cu approved?
And where the numbers on this page come from.Yes. Sold over the counter.
Topical GHK-Cu is permitted in pharmacy compounding. The injectable form was listed in 2023 as possibly presenting significant safety risks, and that nomination was withdrawn in April 2026.
- DoseFrom product labeling and published use.
- Vial sizeFrom what vendors typically list; not a recommendation.
- Sources
- Reviewed22 July 2026
What else is like GHK-Cu?
Others in Skin and cosmetic, side by side.If you're weighing GHK-Cu, it's worth reading Melanotan I (Afamelanotide), Argireline (Acetyl Hexapeptide-8), and SNAP-8 (Acetyl Octapeptide-3) in the same class.
A copper skincare peptide for smoother, firmer, younger-looking skin.
- Dose
- Topical serum, 1-2 pumps
- How often
- Daily
The safer, approved tanning peptide for a slow, protective tan.
- Dose
- 0.5 up to 1 mg per day (loading phase)
- How often
- Daily then weekly
A topical Botox-like peptide that softens fine lines, needle-free.
- Dose
- Serum, per product
- How often
- Daily
A stronger topical wrinkle-smoothing peptide for forehead and eye lines.
- Dose
- Serum, per product
- How often
- Daily
10What these words mean
Show glossary +
What these words mean
- Titrate
- Starting at a low dose and increasing it slowly over time so your body adjusts and side effects stay mild.
- Subcutaneous
- An injection just under the skin, into the fat layer, usually with a short, thin insulin needle.
- Intramuscular (IM)
- An injection into a muscle, using a longer needle.
- Reconstitution
- Mixing a powdered peptide with liquid (bacteriostatic water) so it can be drawn into a syringe.
- Bacteriostatic water
- Sterile water with a tiny amount of preservative, used to mix powdered peptides.
- Concentration
- How strong the mixed peptide is, in milligrams per milliliter (mg/mL). More water makes it weaker; less water makes it stronger.
- Units (on the syringe)
- The marks on an insulin syringe. 100 units equals 1 mL. They measure how much liquid you draw, not the dose in milligrams.
- mcg and mg
- Units of dose. 1 milligram (mg) equals 1,000 micrograms (mcg).
- GLP-1
- A natural gut hormone that lowers appetite and blood sugar. Drugs that copy it, like semaglutide, are used for weight loss.
- Growth hormone secretagogue
- A compound that nudges your body to release more of its own growth hormone, rather than injecting the hormone itself.
- Half-life
- How long a compound stays active in your body. A longer half-life means you inject less often.
- Peptide vs small molecule
- A peptide is a short chain of amino acids. A few items here (like MK-677 or methylene blue) are small molecules, not true peptides, but people use them the same way.
- Research only
- No approved dose or use in people. Sold for research and not reviewed by the FDA for safety or quality.
- Investigational
- Still being tested in clinical trials and not yet approved or legally sold for general use.
- Banned in drug-tested sport
- Prohibited by the World Anti-Doping Agency (WADA); using it can disqualify a competing athlete.
Sources
- Peer-reviewed review, tripeptides in wound healing and skin regeneration(2025)Peer-reviewed review of tripeptides in wound healing.
- NIH PMC, GHK-Cu study(2025)Study of GHK-Cu in tissue repair.
- GHK-Cu regeneration review, PubMed Central
Last reviewed 22 July 2026