GHK-Cu
The copper peptide for skin, hair, and slow repair. Builds over months, stings on the way in, and the trick is more water.
What it is
GHK-Cu is the copper peptide people run for firmer skin, thinning hair, and a general repair signal that makes everything heal a little faster. It is a long play: you will not see it in two weeks, and the shot has a copper sting that the water-to-vial ratio fixes.
The usual user is in their late thirties or older and has noticed the first real skin changes: duller tone, fine lines, slower healing of scrapes and breakouts. The second group is people with thinning hair who have already tried the obvious things. The third is anyone running a healing stack who wants an extra repair signal on top of BPC-157 and TB-500, including people healing after surgery or a procedure. Your body makes GHK-Cu on its own and the level drops steadily from your twenties, which is the whole logic of putting it back.
The timeline is slow and it is the thing people get wrong. Skin texture and tone are the first thing you can see, usually around weeks four to eight: smoother, slightly plumper, old marks fading faster. Users often report small cuts and breakouts closing faster sooner than that, though no study has measured it for injected GHK-Cu. Hair is the slow one: if it does anything, it is three to six months before you can tell, and plenty of people see nothing for hair from injection alone. It will not erase deep wrinkles or regrow a bald patch.
It is a subQ shot (just under the skin with an insulin needle), 2 to 3 mg once a day, with 5 mg as the ceiling for a focused healing push. There is no need to cycle off: the benefits build over months, it is not known to stop working, and the copper in a normal dose is far below the daily upper limit for copper, so there is no build-up reason to take a break. The sting is real: the copper makes the injection feel spicy for a minute or two and can leave a small welt. The fix is dilution. Fill the vial with the maximum water it will take, inject slowly, and rotate sites; a concentrated shot stings badly, a dilute one barely registers. The liquid turns blue, which is correct. A 50 mg vial is about 25 days at 2 mg, 17 days at 3 mg. The other mistake is injecting near the face expecting a local effect; it goes everywhere, so the belly or thigh is fine.
The evidence is unusual: decades of lab and animal work (it was first described in 1973) plus a stack of small human studies, but almost all of the human work is topical, on skin. Creams with GHK-Cu improved skin thickness, firmness, and fine lines in small trials, which is why it is in cosmetics. Animal and lab studies show faster wound closure, more collagen, and hair follicle growth. Injected GHK-Cu for whole-body repair has no human trials; you are extending the skin findings on faith and a lot of community experience. It is gentle, so the bet is cheap.
If your only goal is your face, start with a topical serum: it is cheaper, better studied, and the skin is where the evidence actually lives. GLOW puts GHK-Cu with small amounts of BPC-157 and TB-500 in one vial, a skin-first cruise rather than an injury stack. For hair specifically, AHK-Cu is the sibling with more follicle-focused work, and SNAP-8 is the topical choice for expression lines. Skip the injection if you have Wilson's disease or any copper-handling problem.
What people use it for
Skin and wrinkles
Most evidenceSmall human trials of GHK-Cu creams, run over 8 to 12 weeks, measured thicker, firmer skin and fewer fine lines versus placebo, and lab work shows it stimulates collagen and elastin production. This is the best-supported use and it is topical, which is why skin is where you should expect the clearest result.
Wound and tissue healing
Some evidenceAnimal studies show faster wound closure, more collagen deposition, and better blood supply to healing tissue, and a few small human studies on wounds and ulcers agree. In practice people notice cuts, breakouts, and post-procedure skin closing noticeably faster. Whole-body repair from injection is an extension of this, not a studied outcome.
Hair thickness
Some evidenceLab and animal work shows GHK-Cu enlarges hair follicles and lengthens the growth phase, and it is in several hair products on that basis. Human data on hair is thin and mostly topical. Expect slower shedding and slightly fuller hair over months at best, and be skeptical of regrowth claims from injection alone.
How it works
- Well studied for skin: collagen, firmness, and wound healing
- Widely used in topical cosmetics with good tolerability
- Injectable use for deeper tissue is far less studied
- The anchor ingredient in skin-and-healing blends like KLOW
How people use it
Safety, in brief
Things people sometimes notice
- A sharp, spicy sting for a minute or two as you inject, worse when the solution is concentrated
- A small welt or itchy bump at the site that fades within a day
- Blue liquid in the vial, which is the copper and is correct
- A wave of nausea or feeling lightheaded if you jump straight to 5 mg; drop back and it clears
The full picture — stop signs and who should talk to a doctor first — is on the dosing guide.
Sources
The labels and studies behind this page. Each link opens the original on PubMed, DailyMed or ClinicalTrials.gov.
- GHK Peptide as a Natural Modulator of Multiple Cellular Pathways in Skin Regeneration
- Stimulation of collagen synthesis in fibroblast cultures by the tripeptide-copper complex glycyl-L-histidyl-L-lysine-Cu2+
- Enhanced healing of ulcers in patients with diabetes by topical treatment with glycyl-l-histidyl-l-lysine copper