AHK-Cu Copper Peptide: Hair Research and AHK-Cu vs GHK-Cu
AHK-Cu is a copper peptide studied for hair growth. In a 2007 lab study, it made human hair follicles grow longer and made scalp papilla cells multiply, at strengths of 10 to the minus 12 up to 10 to the minus 9 molar.
That study used follicles and cells in a dish, not a living scalp. AHK-Cu is alanine, histidine and lysine bound to copper. Its cousin GHK-Cu, which starts with glycine instead, is the one with skin research, and this page keeps the two apart.
Short answer
- What is AHK-Cu?
- L-alanyl-L-histidyl-L-lysine bound to copper (Cu2+).
- What has it been tested for?
- Hair growth, in human hair follicles and scalp cells in a dish (2007).
- What about skin?
- No AHK-Cu skin study was found. Skin trials are on GHK-Cu, and a 2026 review calls them small.
- Is it the same as GHK-Cu?
- No. One amino acid differs: alanine in AHK-Cu, glycine in GHK-Cu.
What is AHK-Cu used for in hair research?
It has been tested as a hair growth signal, in one 2007 study on human hair follicles and dermal papilla cells grown in a dish. Dermal papilla cells are scalp cells that help hair follicles form and grow.
The 2007 study added AHK-Cu at very low strengths, from 10 to the minus 12 up to 10 to the minus 9 molar. Here is what it measured:
- Hair follicle length: the follicles grew longer.
- Papilla cell growth: the cells multiplied more.
- Papilla cell death: at 10 to the minus 9 molar, fewer cells died, but the drop was not statistically significant.
The 2007 authors proposed that AHK-Cu may help follicles by pushing papilla cells to multiply and by blocking their death. That is their idea from cell tests. No person was treated, so it is not known whether AHK-Cu grows hair on a living scalp. For other compounds studied for hair, see best peptides for hair growth.
Is AHK-Cu used for skin?
We found no study of AHK-Cu on skin. The copper peptide with skin research is GHK-Cu.
Even for GHK-Cu, the human skin record is thin. A 2026 systematic review says most of its trials are small and test face creams. A 2025 review of GHK as an anti-wrinkle peptide notes a surprising lack of clinical studies. For GHK-Cu used on the skin, see the topical GHK-Cu profile.
Sources: A Systematic Review of the Mechanisms and Therapeutic Applications of GHK-Cu in Topical Microneedle Delivery (July 2026), PubMed 42787770: GHK-Cu human trials small, about 35% share two authors; Topically applied GHK as an anti-wrinkle peptide: Advantages, problems and prospective (2025), PubMed 39963574: few clinical studies of GHK skin products
How is AHK-Cu different from GHK-Cu?
They differ by one amino acid: AHK-Cu starts with alanine, and GHK-Cu starts with glycine. The bigger gap is the research, since GHK-Cu has skin trials and AHK-Cu has one hair study in a dish.
| Feature | AHK-Cu | GHK-Cu |
|---|---|---|
| Building blocks | Alanine, histidine, lysine, plus copper | Glycine, histidine, lysine, plus copper |
| Hair studies found | One lab study on human hair follicles and scalp cells in a dish | Lab and animal work, plus one small human trial of a GHK product without copper |
| Human trials for hair | None found | One trial in 45 men, using a GHK and 5-ALA product. It found no difference between its groups. |
| Human trials for skin | None found | Some, but a 2026 review calls them small and mostly about face creams |
| FDA view | Not named on the FDA compounding safety page | Injectable GHK-Cu is listed. The FDA says it may cause immune reactions and human safety data are limited. |
| Human dose | None published | None in our sources |
Sources: The effect of tripeptide-copper complex on human hair growth in vitro (July 2007), PubMed 17703734: the only AHK-Cu study, human hair follicles and papilla cells in a dish; The human tri-peptide GHK and tissue remodeling (2008), PubMed 18644225: GHK structure, copper binding and reported hair follicle size effect; Efficacy of a Complex of 5-Aminolevulinic Acid and Glycyl-Histidyl-Lysine Peptide on Hair Growth (August 2016), PubMed 27489425: ALAVAX trial in 45 men; A Systematic Review of the Mechanisms and Therapeutic Applications of GHK-Cu in Topical Microneedle Delivery (July 2026), PubMed 42787770: GHK-Cu human trials small, about 35% share two authors; US FDA, Certain Bulk Drug Substances for Use in Compounding that May Present Significant Safety Risks (page dated 22 April 2026): injectable GHK-Cu entry, category 2
Does GHK-Cu help hair?
The hair signals for GHK-Cu come mostly from lab and animal work, and the one human hair trial with a GHK product found no difference. A 2008 review of GHK lists bigger hair follicle size among its reported effects.
A 1993 rat study tested a copper binding peptide called PC1031. On the backs of fuzzy rats, it enlarged hair follicles about as much as topical minoxidil did. The paper does not say PC1031 is AHK-Cu or GHK-Cu.
A 2016 trial gave a product called ALAVAX to 45 men with male pattern hair loss. Its title describes a mix of 5-aminolevulinic acid (5-ALA) and the GHK peptide, without copper. At 6 months, hair length and thickness did not differ among its 3 groups. To read more on the parent peptide, see the GHK-Cu profile.
Sources: The human tri-peptide GHK and tissue remodeling (2008), PubMed 18644225: GHK structure, copper binding and reported hair follicle size effect; Chemical agents and peptides affect hair growth (July 1993), PubMed 8326148: PC1031 copper binding peptide in fuzzy rats; Efficacy of a Complex of 5-Aminolevulinic Acid and Glycyl-Histidyl-Lysine Peptide on Hair Growth (August 2016), PubMed 27489425: ALAVAX trial in 45 men
Are copper peptides safe?
For AHK-Cu, safety is unknown, because no safety study of it was found. For GHK-Cu, the FDA warns that compounded injections may cause immune reactions.
The FDA lists injectable GHK-Cu on its page of compounding ingredients that may present significant safety risks, in category 2. It says the risk comes from the peptide clumping and from impurities, and that human safety data are limited. AHK-Cu is not named on that page. No human study of injected GHK-Cu was found.
The 2016 ALAVAX trial reported no adverse events in any of its 3 groups, but that product had no copper. The 2026 GHK-Cu review also found that about 35% of the GHK-Cu studies it covered list Loren Pickart or Anna Margolina of Skin Biology Inc. as an author, which limits how independent the evidence is.
No source gives a human dose, strength or schedule for AHK-Cu. Disclaimer: this page describes published research only. It is not medical advice, and decisions about hair loss treatment belong with a licensed clinician.
Sources: US FDA, Certain Bulk Drug Substances for Use in Compounding that May Present Significant Safety Risks (page dated 22 April 2026): injectable GHK-Cu entry, category 2; Efficacy of a Complex of 5-Aminolevulinic Acid and Glycyl-Histidyl-Lysine Peptide on Hair Growth (August 2016), PubMed 27489425: ALAVAX trial in 45 men; A Systematic Review of the Mechanisms and Therapeutic Applications of GHK-Cu in Topical Microneedle Delivery (July 2026), PubMed 42787770: GHK-Cu human trials small, about 35% share two authors
Common Questions
Is AHK-Cu good for hair growth?+
It has not been shown in people. A 2007 lab study found AHK-Cu made human hair follicles grow longer in a dish and made scalp papilla cells multiply. No person was treated, so it is not known whether it grows hair on a living scalp.
What's the difference between GHK-Cu and ahk-cu?+
Both are three amino acid peptides bound to copper. GHK-Cu is glycine, histidine and lysine. AHK-Cu is alanine, histidine and lysine. GHK-Cu has far more research, mostly on skin. AHK-Cu has one lab study on hair follicles.
How do you take ahk Cu?+
There is no tested way. No source found gives a human dose or a method of use for AHK-Cu. The 2007 study added it to hair follicles and cells in a dish, not to people.
What are the potential side effects of using copper peptides for hair loss?+
For AHK-Cu, they are unknown, because no safety study was found. A 2016 trial of a GHK and 5-ALA hair product in 45 men reported no adverse events in any of its 3 groups. That product did not contain copper or AHK-Cu.
Does injectable GHK-Cu really work?+
No human study of injected GHK-Cu was found in our sources. The FDA says compounded injectable GHK-Cu may pose a risk of immune reactions, and that there are limited human data to judge its safety.
What are the negative side effects of GHK-Cu?+
Human safety data are thin. For injectable forms, the FDA warns of a possible risk of immune reactions from clumping and impurities. For skin products, a 2025 review of GHK notes a surprising lack of clinical studies.
What are people saying about Neurogan GHK-Cu copper peptide hair & scalp Serum?+
This page does not cover customer reviews of branded products. Reviews are not research. No study of that serum was among the sources we used.
Where can I buy AHK copper peptide?+
This page does not name sellers. AHK-Cu is not an approved medicine, and no official source covers buying it.
Sources: The effect of tripeptide-copper complex on human hair growth in vitro (July 2007), PubMed 17703734: the only AHK-Cu study, human hair follicles and papilla cells in a dish; The human tri-peptide GHK and tissue remodeling (2008), PubMed 18644225: GHK structure, copper binding and reported hair follicle size effect; Efficacy of a Complex of 5-Aminolevulinic Acid and Glycyl-Histidyl-Lysine Peptide on Hair Growth (August 2016), PubMed 27489425: ALAVAX trial in 45 men; US FDA, Certain Bulk Drug Substances for Use in Compounding that May Present Significant Safety Risks (page dated 22 April 2026): injectable GHK-Cu entry, category 2; Topically applied GHK as an anti-wrinkle peptide: Advantages, problems and prospective (2025), PubMed 39963574: few clinical studies of GHK skin products
Related reading
This guide is for educational purposes only and is not medical advice. It describes what published lab, animal and human research reports about AHK-Cu and GHK-Cu. It is not an endorsement or an instruction to use any compound. AHK-Cu is a research compound that is not approved for human use. Talk to a qualified healthcare professional before making any decision about your health.