GHK-Cu vs Copper tripeptide-1
A copper-based ingredient sold in skin creams and injections for wrinkles, hair loss and healing. It speeds wound healing in rats, but no proper human trial exists. A skin-care ingredient sold to firm skin, soften wrinkles and regrow hair. The one controlled human trial, of 13 patients, found no skin benefit.
Both sit at grade C: animal and cell studies. GHK-Cu: Not approved. Copper tripeptide-1: Cosmetic ingredient.
Evidence
CAnimal and cell studies
CAnimal and cell studies
Human studies cited
Animal or cell studies cited
Why the grade
For skin repair and wound healing, the use GHK-Cu is best known for, the primary studies in hand are cell cultures and rat and mouse experiments, including a hair-growth study in fuzzy rats. The human cosmetic results that reviews describe come from manufacturer-run tests that are summarised and not published in full, so no controlled human trial with a known sample size can be named.
For the skin anti-ageing use, the controlled human evidence is a single randomized trial of 13 patients after CO2 laser resurfacing, which found no objective difference in redness or wrinkles. The rest is gene-expression work in cultured cells, animal wound and lung-injury models, and cosmetic-company studies summarized in reviews written by the peptide's discoverer.
FDA
Not approved
GHK-Cu is not approved by the FDA for any use. As copper tripeptide-1 it is sold in cosmetics, which sit outside FDA drug approval. The FDA placed the injectable form in Category 2 of its compounding list in 2023 over safety risks, and the agency now lists that nomination as withdrawn; it plans to bring GHK-Cu before its Pharmacy Compounding Advisory Committee by the end of February 2027.
Cosmetic ingredient
Copper tripeptide-1 is a cosmetic ingredient and sits outside FDA drug approval; no copper tripeptide-1 or GHK-Cu product is approved by the FDA as a drug for any use. Injectable GHK-Cu sold online is not approved and is sold as a research chemical.
Sold for
GHK-Cu is sold as an anti-aging and wound-healing peptide, in serums for wrinkles and hair thinning and as an injectable for recovery.
Copper tripeptide-1 is marketed in serums as a collagen-building, wound-healing peptide that firms skin, softens wrinkles and regrows hair.
Studies say
Cell and animal work shows that GHK-Cu raises collagen production and speeds wound closure in rats, but the human evidence is limited to cosmetic tests reported inside reviews, which is why the grade is C.
Cell and animal studies show it switches on repair genes and speeds wound closure, but the one blinded human trial found no measurable skin benefit over the control regimen, so the evidence is C.
Class
Copper-binding tripeptide
Carrier/copper peptide
Route
Several routes
Topical