GHK-Cu (hair): what it is and what the evidence says
A complex of the GHK tripeptide with copper that is applied to the scalp and studied for its action on the dermal papilla, the blood supply, and the matrix surrounding the follicle.
Last reviewed: August 16, 2026 · How we verify this
The ground it plays on
In aesthetics the route of administration decides almost everything. A peptide that works in a fibroblast culture may not cross intact skin, and then the formulation matters more than the active ingredient. That is why two products listing the same ingredient can give completely different results.
What it is studied for
Hair density, hair caliber, scalp recovery.
There is a distinction that almost always gets lost. A compound being studied for something is not the same as achieving it. And even where it works in a dish or in a mouse, that says little about whether it works in a person or whether the benefit is worth the risk. The section below therefore carries more weight than everything above it.
What the human evidence says
In people there is a 2016 randomized placebo-controlled trial in 45 men with a GHK derivative without copper, which increased hair count, and a 2018 open pilot study with an intradermal formula of several growth factors in which the copper peptide is one component among others.
The limitation that matters most
A randomized trial of GHK-Cu alone in alopecia and a direct comparison with minoxidil or finasteride are still missing; the rest of the support comes from human follicles in culture and from mice, and the contribution of the peptide remains to be separated from that of the other factors and the procedure.
Regulatory status
Cosmetic ingredient (Copper Tripeptide-1), not approved as a drug for hair loss or as an injectable. In the United States, the FDA removed injectable GHK-Cu from its provisional compounding categories on April 15, 2026, which does not make it eligible. It is not listed by name on the WADA 2026 Prohibited List; injectable formulas may fall under S0 or S2.
Status can change and varies by country. Always verify the rules in force where you live before drawing conclusions.
Cautions and context
The route defines safety: by the topical route the expected effect is mild irritation or a greenish tint in light hair, while microneedling and injection add the risk of infection and immune reactions, and those forms lack approval. With Wilson disease or other copper disorders, its use is decided with the doctor.
With suspected scarring alopecia, sudden or patchy hair loss, copper disorders, pregnancy, or a recent procedure on the scalp, it is worth assessing with a dermatologist.
What this page cannot give you
A reference page can take you this far. You know what GHK-Cu (hair) is and where its research stands, which already puts you ahead of most readers. Four questions remain that no encyclopedia can answer for you, because the answers depend on your own situation:
- What would you measure beforehand, so that later you could tell whether anything actually changed?
- What would you watch along the way, and how consistently?
- What would you ask a professional, and in how much detail, so you do not walk out with a textbook answer?
- What would make you stop?
That is what the course is for
PeptiXtreme is ${CIF.LECCIONES} lessons that hand out no numbers. Each one ends with your starting point, what to watch along the way, the specific questions you take to a professional and the signals that mean stop. It includes per-module exams, a Certificate of Completion with a verifiable certificate ID, a Progress Tracker to follow how you are doing, and a human advisor you can actually write to.
See the course → Or measure your judgment, freeReferences
Every entry links to its record on PubMed, the US National Library of Medicine database. Open them and check. We would rather have a reader who verifies than one who takes our word for it.
- The effect of tripeptide-copper complex on human hair growth in vitropreclinical Arch Pharm Res · 2007 · PMID 17703734 →
- The hair follicle-stimulating properties of peptide copper complexes. Results in C3H micepreclinical Ann N Y Acad Sci · 1991 · PMID 1809108 →
- Chemical agents and peptides affect hair growthreview J Invest Dermatol · 1993 · PMID 8326148 →
- Intradermal injections of a hair growth factor formulation for enhancement of human hair regrowth - safety and efficacy evaluation in a first-in-man pilot clinical studyhuman J Cosmet Laser Ther · 2018 · PMID 29482481 →
- QR678 & QR678 Neo Hair Growth Formulations: A Cellular Toxicity & Animal Efficacy Studypreclinical Plast Reconstr Surg Glob Open · 2020 · PMID 32983753 →
- Stem cell recovering effect of copper-free GHK in skinpreclinical J Pept Sci · 2012 · PMID 23019153 →
- EGCG-Biotin-Pal-GHK composition modulates TGF-beta and BMP pathways in scalp microenvironment for treating stress-induced alopeciapreclinical Eur J Pharmacol · 2026 · PMID 42575238 →
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Frequently asked questions
What is GHK-Cu (hair)?
A complex of the GHK tripeptide with copper that is applied to the scalp and studied for its action on the dermal papilla, the blood supply, and the matrix surrounding the follicle. It is studied within the area of aesthetic.
Is there human evidence for GHK-Cu (hair)?
In people there is a 2016 randomized placebo-controlled trial in 45 men with a GHK derivative without copper, which increased hair count, and a 2018 open pilot study with an intradermal formula of several growth factors in which the copper peptide is one component among others.
Is it approved by any health agency?
Cosmetic ingredient (Copper Tripeptide-1), not approved as a drug for hair loss or as an injectable. In the United States, the FDA removed injectable GHK-Cu from its provisional compounding categories on April 15, 2026, which does not make it eligible. It is not listed by name on the WADA 2026 Prohibited List; injectable formulas may fall under S0 or S2.
What is the dose of GHK-Cu (hair)?
We do not publish dosages. This is not an oversight. No single figure works for everyone: the regimen depends on a person's medical history, on whatever medication they already take, and on the goal they are chasing, which is something a professional weighs with the case in front of them. What you can build is the ability to walk into that appointment knowing what to ask.
Where can I learn to evaluate this properly?
This page tells you what GHK-Cu (hair) is and what the evidence says. The PeptiXtreme course teaches the other half: what you would measure before considering anything, what you would watch, the specific questions you would take to a professional and when you would stop.