# What does GHK-Cu do?

Updated October 17, 2026. Source: https://whatdoesghkcudo.com/

## Short answer

In small, mostly industry-funded skin studies, GHK-Cu creams were linked to fewer fine lines and firmer, thicker skin after about 12 weeks.[1][3] GHK-Cu is a copper-bound peptide found naturally in human blood, and in lab and animal studies it increases collagen and aids wound repair.[1][8][9] Those effects are not proven in people, and injected forms have little human safety data.[4][12]

## What are you hoping it will do?

If any of these apply, mention them in the assessment:

- **You want fewer fine lines:** Small human cream studies, mostly funded by the cosmetic industry, reported fewer fine lines over about 12 weeks.[1][3] A randomized trial after laser treatment found no wrinkle difference.[7]
- **You want firmer, thicker skin:** One 12-week study of 67 women reported better firmness and thickness.[1] Reports like this are small and incompletely described.[4]
- **You want thicker hair:** Very limited human evidence. One 6-month trial of a GHK scalp spray raised hair count at one dose but did not change hair thickness.[10]
- **You want faster healing after an injury:** GHK-Cu wound effects come from animal studies, and a human wound trial has no results yet.[9][4] Human evidence for BPC-157 is limited to 3 small studies, and FDA found no human data for TB-500.[17][12]
- **You want to slow aging:** Gene and longevity claims rest on lab and computer analysis only and remain untested hypotheses.[2][4]

## Key facts

- **Best-supported use:** Creams and serums for aging skin, the only use with several human studies, though they are small.[1][3]
- **Strongest human evidence:** A 2026 systematic review found 20 studies of GHK-Cu in aesthetic medicine.[5] Only 2 were randomized controlled trials; the other 18 were lab or animal studies.[5]
- **What lab studies suggest:** In cells and animals, GHK-Cu increased collagen, promoted new blood vessels and lowered inflammatory signals.[5]
- **Hair:** Thin evidence: one small trial of a GHK combination product and one small eyebrow study.[4][10]
- **How it’s used:** Mostly as creams and serums, sold for decades.[3] Some people now inject it, often bought from unregulated online sellers.[3]
- **FDA status of injectable forms:** Not an approved drug.[3] FDA has flagged injectable GHK-Cu for possible immune reactions and limited human safety data.[3][12]

## What GHK-Cu does, by strength of evidence

| Claimed effect | What the evidence shows |
| --- | --- |
| Fewer fine lines and wrinkles | **Human, small.** Reviews describe 12-week cream studies in 71 women (face) and 41 women (eyes), with the eye cream doing better than a placebo and a vitamin K cream.[1] In a randomized, double-blind 8-week trial, GHK-Cu in a lipid carrier cut wrinkle volume by 55.8% compared with the carrier alone.[2] These trials were generally small and funded by the cosmetic industry, and a 2026 review noted many were short, conference-based or used multi-ingredient products.[3][4] |
| Firmer, thicker skin | **Human, small.** In a 12-week study of 67 women aged 50 to 59, a twice-daily GHK-Cu cream improved firmness and increased skin density and thickness.[1] A 2026 review described historical cosmetic reports like this one as small or incompletely characterized.[4] |
| Better healing after laser skin treatment | **Human, randomized, 13 patients.** Blinded evaluators found no difference in redness, wrinkles or overall skin quality between people who did and did not use GHK-Cu products after laser resurfacing.[7] People using GHK-Cu did report higher satisfaction.[7] |
| More collagen | **Mostly lab.** In skin cell (fibroblast) cultures, GHK-Cu increased collagen production at very low concentrations.[8] In a small human pilot study, collagen rose in 70% of women using a GHK-Cu cream, compared with 50% using vitamin C and 40% using retinoic acid.[1][2] |
| Wound healing | **Animal.** In rats, GHK-Cu injected into experimental wounds increased collagen and other connective tissue, with larger doses having larger effects.[9] Studies in rabbits and rats also reported faster healing and more new blood vessels.[2] A phase 2 trial in human acute wounds is still recruiting and has no results.[4] |
| Hair growth | **Human, very limited.** In a 6-month randomized trial of 43 people with pattern hair loss, a daily scalp spray combining GHK peptide with 5-ALA raised hair count compared with placebo at one dose, but did not change hair thickness or length.[10] An 18-person eyebrow study reported better hair results but did not define the GHK-Cu product it tested.[4] |
| Less inflammation, antioxidant effects | **Lab and animal.** Preclinical studies found GHK-Cu lowered inflammatory signals such as TGF-beta and IL-6.[5] In mice, it protected the lungs from induced injury and reduced the build-up of inflammatory cells.[2] |
| “Resetting” genes, anti-aging | **Lab and computer analysis only.** Gene database analyses suggest GHK changes the activity of about 31% of human genes by 50% or more.[2] A 2026 review classed gene-resetting and longevity effects as hypotheses that still need testing.[4] |

## How it’s thought to work

- **A copper carrier:** GHK is a small peptide found in human blood, saliva and urine.[1] It is proposed to act as a complex with copper that supports wound healing and skin repair.[1]
- **Levels fall with age:** Blood levels of GHK are about 200 ng/mL at age 20 and fall to about 80 ng/mL by age 60.[2]
- **Skin structure:** In cell and animal studies, GHK-Cu increases type I collagen and glycosaminoglycans, adjusts enzymes that break down tissue, and promotes new blood vessels.[5]
- **What is proven:** A 2026 review found only a few direct effects in skin and immune cells are well supported, while broad gene and longevity effects remain unproven ideas.[4] It concluded that GHK-Cu is promising but unproven until controlled clinical trials show it works.[4]

## Topical vs injected

- **Creams and serums:** Copper peptide creams and serums have been sold for decades and tested in human trials.[3]
- **Getting through the skin:** GHK-Cu dissolves easily in water and is unstable, which makes it hard to formulate.[6] A 2025 review still judged it relatively skin permeable.[6]
- **Delivery tools:** In studies, microneedles and liposomes markedly increased how much GHK-Cu passed into the skin.[5]
- **Injections:** Whether injected GHK-Cu is safe or works has not been shown in any published human study.[3] Many people who inject it buy it from grey-market online sellers.[3]

## Side effects and unknowns

- **On the skin:** In a 6-month hair trial of a GHK scalp spray, no side effects were reported in any group.[10] Copper is a very weak skin allergen, but in rare cases it can cause allergic reactions.[11]
- **Immune reactions:** FDA says injectable GHK-Cu may trigger immune reactions because the peptide can clump and carry impurities, and that human safety data are limited.[12]
- **Too much copper:** Possible injection risks include taking in too much copper.[3] One clinician told NPR he has seen raised copper and liver enzymes in patients who injected large amounts on their own.[3]
- **Product quality:** Injectable products from unregulated sellers carry no assurance of quality or dose, or even that they contain a copper peptide.[3]

## Regulatory status

- **GHK-Cu:** GHK-Cu is not an FDA-approved drug, and U.S. compounding pharmacies are not technically allowed to offer it for injection.[3] FDA lists injectable GHK-Cu among substances previously in its “category 2” of possible safety risks whose nominations were withdrawn.[12] Non-injectable GHK-Cu is still under FDA evaluation for compounding, and FDA has said it intends to consult its advisers on GHK-Cu before the end of February 2027.[13]
- **BPC-157 and TB-500 (also in the blend):** BPC-157 is a lab-made peptide based on part of a compound found in human stomach juice, and TB-500 is a 7 amino acid fragment of thymosin beta-4.[14][15] FDA has called products sold as BPC-157 and TB-500 unapproved new drugs.[16] Human evidence for BPC-157 is limited to 3 small studies with 30 people, and FDA has found no human exposure data for TB-500.[17][12]
- **Pending changes:** In July 2026, FDA advisers voted to recommend letting pharmacies compound BPC-157 and TB-500, but the vote is non-binding.[18] An FDA interim policy on compounding certain peptides reached White House review on October 14, 2026, and the peptides it covers are not public.[19]

## Common questions

### Does GHK-Cu work for wrinkles?

The evidence is limited and comes from small studies.[1][3] Studies lasting 12 weeks reported fewer fine lines and shallower wrinkles with GHK-Cu creams, including an eye cream tested against a placebo.[1] But these trials were small and mostly industry-funded, and in a randomized trial after laser treatment, blinded evaluators saw no difference in wrinkles.[3][7]

### Does GHK-Cu help hair grow?

There is very little human evidence.[4][10] A 6-month randomized trial of a GHK and 5-ALA scalp spray raised hair count at one dose but did not change hair thickness.[10] An 18-person eyebrow study reported gains but did not define the GHK-Cu product it used.[4]

### How long does GHK-Cu take to work?

Human skin studies measured results after 8 to 12 weeks of regular use, often twice a day.[1][2] The hair trial ran 6 months.[10] There are no published human studies of injected GHK-Cu, so there is no timing data for injections.[3]

### Does GHK-Cu boost collagen?

In lab cultures of skin cells, yes: GHK-Cu increased collagen production.[8] In rats, it increased collagen in healing wounds.[9] In people, the evidence is a small pilot study in which collagen rose in 70% of women using a GHK-Cu cream.[1][2]

### What are the side effects of GHK-Cu?

No side effects were reported in a 6-month trial of a GHK scalp spray.[10] Copper can rarely cause a skin allergy.[11] For injections, FDA flags possible immune reactions and limited human data, and a clinician has described injection site irritation, infections and high copper levels in people who self-injected.[12][3]

### Does injecting GHK-Cu work better than applying it?

There is no published evidence that it does.[3] Topical GHK-Cu has been tested in small human trials, but no published human studies show injecting it is safe and effective.[3] One clinician told NPR that, in his experience, topicals work much better for skin and hair and injections have minimal impact.[3]

## Next step

**See if a provider recommends GHK-Cu.** Complete an online health assessment. A licensed provider reviews it and decides whether a GHK-Cu blend or another option is appropriate. The blend offered through this assessment also contains BPC-157 and TB-500.

What the assessment includes:

- Online health assessment
- Review by a licensed provider
- Shipped to you if prescribed
- Card held at checkout, charged only if prescribed

How to get started:

1. **Answer health questions.** An online assessment about your health, history and goals.
2. **A licensed provider reviews it.** They decide whether a prescription is safe and appropriate for you.
3. **If prescribed, it ships to you.** Your card is only held at checkout. You’re charged only if a provider prescribes.

Not everyone qualifies. A provider decides based on your health history.

Start the assessment: https://whatdoesghkcudo.com/go/md/agent

Assessments are completed with a partner telehealth provider. This site may earn a commission if you start one through it.

## Sources

1. GHK Peptide as a Natural Modulator of Multiple Cellular Pathways in Skin Regeneration (Pickart L, Vasquez-Soltero JM, Margolina A). BioMed Research International, via PubMed Central. July 7, 2015. https://pmc.ncbi.nlm.nih.gov/articles/PMC4508379/
2. Regenerative and Protective Actions of the GHK-Cu Peptide in the Light of the New Gene Data (Pickart L, Margolina A). International Journal of Molecular Sciences, via PubMed Central. July 7, 2018. https://pmc.ncbi.nlm.nih.gov/articles/PMC6073405/
3. People are injecting copper peptides ahead of the science (Will Stone). NPR. September 7, 2026. https://www.npr.org/2026/09/07/nx-s1-5955552/copper-peptides-skin-aging-health-safe
4. GHK-Cu as a Bioactive Metallopeptide and Drug-Delivery Cargo: Coordination Chemistry, Formulation Science, Therapeutic Evidence, and a Translational Roadmap (Mateescu DM, et al.). Pharmaceutics, via PubMed Central. August 27, 2026. https://pmc.ncbi.nlm.nih.gov/articles/PMC13610439/
5. The Regenerative Potential of GHK-Cu in Aesthetic Medicine (Mokhtar J, et al.). Aesthetic Surgery Journal, via PubMed. August 20, 2026. https://pubmed.ncbi.nlm.nih.gov/42619529/
6. Topically applied GHK as an anti-wrinkle peptide: Advantages, problems and prospective (Mortazavi SM, Mohammadi Vadoud SA, Moghimi HR). BioImpacts, via PubMed. 2025. https://pubmed.ncbi.nlm.nih.gov/39963574/
7. Effects of topical copper tripeptide complex on CO2 laser-resurfaced skin (Miller TR, et al.). Archives of Facial Plastic Surgery, via PubMed. July 2006. https://pubmed.ncbi.nlm.nih.gov/16847171/
8. Stimulation of collagen synthesis in fibroblast cultures by the tripeptide-copper complex glycyl-L-histidyl-L-lysine-Cu2+ (Maquart FX, et al.). FEBS Letters, via PubMed. October 1988. https://pubmed.ncbi.nlm.nih.gov/3169264/
9. In vivo stimulation of connective tissue accumulation by the tripeptide-copper complex glycyl-L-histidyl-L-lysine-Cu2+ in rat experimental wounds (Maquart FX, et al.). Journal of Clinical Investigation, via PubMed. November 1993. https://pubmed.ncbi.nlm.nih.gov/8227353/
10. Efficacy of a Complex of 5-Aminolevulinic Acid and Glycyl-Histidyl-Lysine Peptide on Hair Growth (Lee WJ, et al.). Annals of Dermatology, via PubMed Central. July 26, 2016. https://pmc.ncbi.nlm.nih.gov/articles/PMC4969472/
11. Copper hypersensitivity (Fage SW, Faurschou A, Thyssen JP). Contact Dermatitis, via PubMed. October 2014. https://pubmed.ncbi.nlm.nih.gov/25098945/
12. Certain Bulk Drug Substances for Use in Compounding that May Present Significant Safety Risks. U.S. Food and Drug Administration. Content current as of April 22, 2026. https://www.fda.gov/drugs/human-drug-compounding/certain-bulk-drug-substances-use-compounding-may-present-significant-safety-risks
13. Bulk Drug Substances Nominated for Use in Compounding Under Section 503A of the Federal Food, Drug, and Cosmetic Act. U.S. Food and Drug Administration. Updated May 14, 2026. https://www.fda.gov/media/94155/download
14. BPC-157: What Athletes Should Know About the Prohibited Experimental Peptide. U.S. Anti-Doping Agency (USADA). Updated August 10, 2026. https://www.usada.org/spirit-of-sport/bpc-157-peptide-prohibited/
15. FDA Briefing Document: TB-500-Related Bulk Drug Substances, Pharmacy Compounding Advisory Committee. U.S. Food and Drug Administration. July 2026. https://www.fda.gov/media/193349/download
16. Warning Letter: Warrior Labz SARMS, MARCS-CMS 655280. U.S. Food and Drug Administration. June 12, 2023. https://www.fda.gov/inspections-compliance-enforcement-and-criminal-investigations/warning-letters/warrior-labz-sarms-655280-06122023
17. Human evidence for BPC-157 in orthopaedic and regenerative medicine: a systematic review of efficacy and safety (Poolton JT, Minett J, Kazmi A). Acta Orthopaedica Belgica, via PubMed. October 8, 2026. https://pubmed.ncbi.nlm.nih.gov/42885452/
18. FDA advisers narrowly vote to add 6 peptides to a drug compounding list. What's next?. ABC News. July 24, 2026. https://abcnews.com/Health/fda-advisers-narrowly-vote-add-6-peptides-drug/story?id=135064915
19. FDA Submits Interim Peptide Compounding Policy for White House Review: What Pharmacies Should Know. Buchanan Ingersoll & Rooney PC. October 16, 2026. https://www.bipc.com/fda-submits-interim-peptide-compounding-policy-for-white-house-review-what-pharmacies-should-know

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General education, not medical advice. Talk to a licensed clinician before starting or changing any medicine.