GHK-Cu
The short answer: GHK-Cu is a three-amino-acid peptide bound to copper that occurs in human blood. As of October 17, 2026 it is legal as a cosmetic ingredient but not FDA-approved as a drug, and its decades of small human studies tested skin creams, not injections.
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What is GHK-Cu?
GHK is a tripeptide (glycine-histidine-lysine) that binds copper. It occurs naturally in human blood, which describes its origin, not its safety as a product.
As a skin cream it has been studied for decades. Injecting it is a newer trend with no published human data.
What is GHK-Cu claimed to do, and what does the evidence show?
| Use | Claimed | Shown | Grade |
|---|---|---|---|
| Skin (as a cream) | Firmer skin, fewer wrinkles | Decades of small human studies of copper peptide creams, many funded by the cosmetics industry.[3] | Evidence grade C |
| Skin and hair (injected) | Whole-body skin and hair benefits | No published human study of injected GHK-Cu.[5] | Evidence grade U |
What are the known risks and side effects of GHK-Cu?
An unapproved product has no required quality testing. In July 2026 FDA staff told the agency's advisers they had concerns about impurities, bacterial toxins and unreliable certificates for several of these peptides, and that nobody knows how often they trigger an immune response.
GHK-Cu carries copper. Clinicians quoted by NPR in September 2026 described raised liver-enzyme and copper levels in some people who injected it; the cause was not established.
- People with liver disease or a copper-related condition such as Wilson disease. GHK-Cu adds copper.
- People who are pregnant, trying to get pregnant or breastfeeding. There is no human data in pregnancy.
- Anyone under 18. It has not been studied in young people.
- Tested athletes and service members. Check with USADA or your service's rules first. A positive test counts whatever the label said.
- People taking prescription medicines. Interactions have not been studied. Bring the product label to your clinician.
- Swelling of the face, lips or throat, trouble breathing, chest pain, a racing heart or fainting. Call 911.
- Redness spreading from an injection site, warmth, pus or a fever. Get same-day care.
- Unsure what you took or whether a reaction is serious: Poison Control 1-800-222-1222 (free, 24 hours).
- Thoughts of harming yourself: call or text 988.
Is GHK-Cu legal?
Legal as a cosmetic ingredient; not FDA-approved as a drug.[1,4] Injectable form off Category 2 since April 15, 2026 but not eligible for compounding; FDA advisers are due to review it before the end of February 2027.[1,4]
Every status change for GHK-Cu is logged with its date and source in the regulatory tracker entry for GHK-Cu.
Is GHK-Cu banned in sport?
Not named on the 2026 WADA List. Because it is unapproved, the catch-all S0 section may still apply; ask USADA before use.[2] Anti-doping rules work on strict liability: a positive test counts whatever the label said.
What don't we know about GHK-Cu?
- Whether injected GHK-Cu does anything in people: no published human study.
- Copper load over time in people who inject it.
- What is actually in products sold for injection.
What should you tell your doctor if you're using GHK-Cu?
Tell them exactly what you took, for how long, and where it came from, and bring the label. These questions can help the conversation:
- Is there an approved treatment for my goal that has been tested in people?
- What should I watch for, and which symptoms mean I should stop and call you?
- Could it interact with the medicines I already take?
Compare next
- US Food and Drug Administration. 503A bulk drug substances: interim categories, updated April 15, 2026 , 2026-04-15.
- World Anti-Doping Agency. 2026 Prohibited List (sections S0 and S2) , 2026-01-01.
- International Journal of Molecular Sciences. Regenerative and protective actions of the GHK-Cu peptide in the light of the new gene data , 2018.
- Frier Levitt. FDA peptides 'do not compound' list update 2026 , 2026-04-16. (law-firm or secondary summary)
- NPR. The copper peptide trend has gone from creams to injections, ahead of the science , 2026-09-07. (news report)