GHK-Cu: What The Studies Actually Say

GHK-Cu is sold two ways: in face creams, and in vials.

Nearly all the research in people put it on the skin. Here is what that research actually found. Every claim has a link. Read them yourself.

What it is

GHK is three amino acids in a row: glycine, histidine and lysine. It was found in human blood in 1973, as something that kept normal liver cells alive longer — and made cancerous liver cells grow. Nature New Biology, 1973

GHK readily grabs copper. With copper attached, it is called GHK-Cu. Its discoverer's team proposed that its job is carrying copper into cells. Nature, 1980

In lab dishes, the cells that make collagen made more of it at tiny amounts of GHK-Cu — as little as a trillionth of a mole per litre. FEBS Letters, 1988 In rats, it built up more collagen in wound chambers under the skin. J Clin Invest, 1993 But in rats, GHK put into a vein was broken down fast. J Chromatogr B, 1997

On skincare labels it is "copper tripeptide-1". EU CosIng It is also marketed as an injectable peptide. FDA's compounding lists name "GHK-Cu (for injectable routes of administration)". FDA · Review, 2026

It was tested as a wound drug. It did not make it.

In the early 1990s a company called ProCyte developed GHK-Cu as a wound gel, Iamin. Seattle Times, 1996

Trial	Wound	People	Result
Diabetic ulcers, 1994	Foot-sole ulcers	Not given	Better than plain gel
Leg ulcers, 1992	Venous ulcers	86	No better than placebo
ProCyte's big trial, 1994	Not stated	511	No better than its control group

The good one. In people with diabetes, the middle foot-sole ulcer on GHK-Cu gel was 98.5% closed, against 60.8% on plain gel. In ulcers treated right after dead tissue was cut away, 7% got infected, against 34%. Everyone also got strong standard wound care. The summary we could read does not say how many people took part. Wound Repair Regen, 1994

The flop. In 86 people with leg ulcers, a copper-tripeptide cream did no better than placebo. An ordinary cream, silver sulfadiazine, beat both. The paper's summary does not name the exact peptide. J Vasc Surg, 1992

The big one. A newspaper reported that ProCyte's 511-patient trial did no better than its control group. We found no journal paper for it, so treat it as reported, not checked. Seattle Times, 1996

So in 1996, FDA cleared Iamin only as a wound dressing — a medical device, not a drug. FDA 510(k), 1996 A new trial, testing GHK-Cu gel on small test wounds in about 60 healthy adults, is due to finish its main measurements around February 2027. Trial record

The famous wrinkle number

In the most quoted skin study, 40 women put a GHK-Cu serum on one side of the face for 8 weeks. For 20 of them, the other side got a plain serum: no GHK-Cu, and none of the special carrier that delivers it. J Aging Sci, 2016

You may have seen "55.8% less wrinkle volume." That is not how much the wrinkles shrank. It is how much better the GHK-Cu side did than the plain side, as a share. Here is how much they actually shrank:

Plain−15.0%

GHK-Cu−24.1%

Wrinkle depth went the same way: down 20.3%, against 15.3%. The gap was statistically significant. J Aging Sci, 2016

But look at what sits under it:

• One wrinkle per woman was measured, near the corner of the eye.
• The plain side lacked the carrier too. So the gap cannot be pinned on GHK-Cu alone.
• It was paid for by Snowberry, the company whose serum was tested, with Callaghan Innovation.

Other skin and hair studies

Study	People	How long	Compared with	What happened
After laser skin treatment, 2006	13	12 weeks	Same skincare, no GHK-Cu	No difference in measured redness or wrinkles. Only patients' own ratings favoured GHK-Cu
Face and eye creams, 2002	71 and 41 women	12 weeks	Details unknown	Conference abstracts. No numbers to check
Hair spray, 2016	45 men	6 months	Placebo	Some hair-count gain. Not GHK-Cu: GHK plus 5-ALA, no copper
Scalp injections, 2018	1,000	Up to 1 year	Nobody	Less hair fall. GHK-Cu was 1 of 6 ingredients
Flaky scalp, 2024	29	15 days	Nobody	Less flaking. Many ingredients

Read the last two columns. Two studies had no comparison group at all. The hair spray had no copper in it. Ann Dermatol, 2016 We found no controlled trial of GHK-Cu alone for hair loss.

The face-cream results are conference abstracts, known only from a review by GHK's discoverer. That review lists Skin Biology, a company that sells copper-peptide creams, as its affiliation. Int J Mol Sci, 2018

The famous claims nobody measured

"Your GHK drops as you age." The figure you see — about 200 ng/mL at age 20, falling to 80 by 60 — appears in the discoverer's reviews with no measurement study cited. Int J Mol Sci, 2018 The only independent measurement we found compared 9 people with the lung disease COPD to 11 healthy people of similar age. The COPD group had about half as much. That says nothing about age. J Cachexia Sarcopenia Muscle, 2023

"It resets thousands of genes." That comes from a computer re-analysis of three lab tests on cancer cells in a dish. No human tissue. All three authors list Skin Biology as their affiliation. Biomed Res Int, 2014 Two other computer studies, on emphysema and colon cancer, gave GHK to no patient. Genome Med, 2012 · Clin Exp Metastasis, 2010

Everything else is mice and rats

What was tested	Animals	What happened
Wounds with poor blood supply	24 rats	Wound area shrank 64.5% in 13 days, vs 45.6% on plain gel and 28.2% untreated
Wounds on irradiated skin	23 rats	No benefit
Knee ligament surgery	72 rats	Knee steadier at 6 weeks. Gone by 12 weeks
Lung injury and scarring (1, 2, 3, 4)	Mice	Less inflammation and damage
Smoke-weakened muscle	Mice	Grip strength nearly doubled at the higher dose
Alzheimer's-like disease	Mice	Fewer plaques, memory decline delayed
Aging brain (not yet peer-reviewed)	Mice	Helped on a learning test via the nose. As a shot, a brief gain in males only
Inflamed colon	Mice	Less inflammation

None of this has been tested in people. A mouse result tells scientists what to test next. It does not tell you what happens in a person. Several of these come from a small number of research groups. Two more rodent studies, on learning and anxiety, named plain GHK, not GHK-Cu. Aging Pathobiol Ther, 2023 · Bull Exp Biol Med, 2015

What about side effects?

On the skin, the studies found little. In the face study, 1 of 40 women had minor skin reactions, on both sides of her face. They cleared up without treatment after she stopped. J Aging Sci, 2016 The hair-spray trial reported no side effects. Ann Dermatol, 2016 In lab skin cells, GHK-Cu did not cause irritation. Plain copper salts did. Sci Rep, 2016

As a shot, nobody has checked. FDA says injectable GHK-Cu may set off immune reactions, because it can clump and carry impurities. It adds that there is little human data on its safety. FDA The US trial registry listed no trial of injected GHK-Cu in September 2026. ClinicalTrials.gov The only published human injection report we found is that scalp study: six ingredients, no comparison group. It cannot show that GHK-Cu alone is safe. J Cosmet Laser Ther, 2018

The cancer question is open. The 1973 paper found GHK made cancerous liver cells grow. Nature New Biology, 1973 In 1980, tiny amounts had effects on cells "ranging from the stimulation of growth and differentiation to outright toxicity". Nature, 1980 A computer study points the other way. Clin Exp Metastasis, 2010 There is no human data either way.

Is it approved?

Not as a medicine, anywhere we found.

• United States: No FDA-approved drug contains GHK-Cu. Drugs@FDA The 1996 wound-dressing clearance was for a device, not a drug. FDA 510(k)
• Europe: No approved medicine. EMA It is allowed in cosmetics as copper tripeptide-1. EU CosIng
• Everywhere else: our search found no medicine approval.

What about pharmacies?

1. Injectable GHK-Cu was on FDA's list of compounding ingredients with significant safety risks. The people who had asked FDA to allow it withdrew their requests. It now sits on a "nominated but withdrawn" list, with FDA's safety concerns still printed there. That was paperwork, not a new safety finding. FDA
2. GHK-Cu used any way except injection has been back "under evaluation" since May 2026. FDA list
3. It is not on FDA's list of bulk ingredients approved for compounding. FDA plans to ask its advisory committee about it before the end of February 2027. No date is set. FDA list · FDA committee page

What is still unknown

• Whether a shot of GHK-Cu does anything in people.
• How a shot is absorbed and cleared, what amount is safe, whether it triggers the immune system, and what it does to the body's copper balance.
• How much reaches deep skin from an ordinary cream. GHK-Cu is very water-loving, so it crosses the skin's outer barrier poorly.
• Whether blood GHK really falls with age.
• The size of the 1994 ulcer trial, and the full results of the failed 511-patient one.
• Whether it affects cancer in people, either way.
• Anything about lungs, brain, gut or muscle in people.
• Still pending: the new wound-gel trial, a skin-patch trial that will measure blood GHK, and FDA's committee review.

What is in the bottle is not what was studied

One more thing.

Nearly every human result on this page came from something put on the skin: a wound gel, a face serum, a hair spray. The rest came from cells, mice and rats. None of it tested a vial bought online.

FDA specifically flags clumping and impurities in injectable GHK-Cu. FDA

No study has ever shown that a product sold online as "GHK-Cu" is the same thing. Not the same purity. Not the same strength. Not even proof it is the same molecule.

So take every number on this page for what it is. It describes the gels, serums and lab samples those studies used. It describes nothing else.

How to check a number yourself

You are going to see more claims about GHK-Cu. In a reel. In a comment. On somebody's store page.

Here is how to tell a real one from a marketing one. Five questions. About ten seconds each.

1. Is there a link to a study?

A real number comes from a paper you can open. No link means it is a claim, not a result. Search the name on pubmed.gov yourself. A conference abstract is not a full paper, either. Nobody outside can check its numbers.

2. Was it in people, and how did it get in?

Most of the exciting GHK-Cu claims come from mice. Nearly every human result was on the skin. A face-serum result tells you nothing about a shot.

3. Is it a drop, or a gap?

"55.8% less wrinkle volume" sounds like wrinkles shrank by more than half. They shrank 24%, against 15%. When a number looks huge, ask: 55.8% of what?

4. Was it GHK-Cu alone, against nothing?

Without a group that got nothing, nobody can tell what the product did. The scalp-injection study had six ingredients and no such group.

5. Who paid for it?

The wrinkle study was paid for by the serum's maker. The gene claims, and the review that reports the famous cream numbers, come from authors at a company that sells copper-peptide products. That is common. It matters more when nobody else has repeated the work.

Now run those five on this page

Every number above links to its paper and says whether it came from people, rodents or a dish. The comparison groups are in the tables. The paid-for studies are flagged.

The famous claims — "resets your genes", "your GHK drops with age", "regrows hair" — have no study in people behind them that we could find.

That is the whole difference: a number you can check, and a number you are asked to believe.

This page has a date on it, near the top. When the new wound-gel trial reports, or FDA's committee meets, this page changes.

Read the studies yourself

• Wound trials: Diabetic ulcers, 1994 — the best human result · Leg ulcers, 1992 · Seattle Times, 1996 · New trial record
• Skin and hair: Wrinkle study, 2016 (PDF) · Laser skin, 2006 · Hair spray, 2016 · Scalp injections, 2018 · Flaky scalp, 2024
• Reviews and gene claims: Discoverer's review, 2018 · GHK and DNA, 2014 · Emphysema, 2012 · Colon cancer, 2010 · Sports-medicine review, 2026
• Lab: 1973 · 1980 · 1988 · Skin cells, 2016
• Rats: Wound chambers, 1993 · Breakdown, 1997 · Poor blood supply, 2003 · Irradiated skin, 2013 · Knee, 2015 · Anxiety, 2015
• Mice: Lung, 2016 · Lung, 2020 · Lung, 2022 · Silicosis, 2024 · Muscle, 2023 · Alzheimer's, 2024 · Learning, 2023 · Aging brain, 2026 · Colon, 2025
• Rules and records: FDA safety-risk list · FDA compounding list (PDF) · FDA committee · FDA 510(k) · Drugs@FDA · EMA · EU CosIng · ClinicalTrials.gov · Skin-patch trial

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Everything above describes what studies tested: mostly gels, creams and sprays on people's skin, and lab and animal experiments. This is not advice, a plan, or instructions. GHK-Cu is not an approved medicine. Research compounds are not for human or animal use.