GHK-Cu (Copper Tripeptide-1)

GHK-Cu is the copper(II) complex of GHK, a naturally occurring human tripeptide made of glycine-histidine-lysine (Gly-L-His-L-Lys). GHK is found in plasma, saliva, and urine and binds copper ions with high affinity. Notably, the body's level of GHK declines with age: roughly 200 micrograms/liter in plasma around age 20-25, falling to about 80 micrograms/liter by age 60-80. As a cosmetic ingredient it is listed under the INCI name "Copper Tripeptide-1" and appears in serums, creams, and post-procedure topicals. It is best understood as a topical/cosmetic skin-conditioning active, not a drug.

Education only. This page summarises published research on a cosmetic or dietary ingredient. It is not medical advice and makes no treatment claims; for a finished product, follow its label.

Also known as: GHK-Cu, Copper Tripeptide-1, Copper Peptide, Glycyl-L-Histidyl-L-Lysine copper(II) complex, Cu-GHK, INCI: Copper Tripeptide-1, Prezatide copper acetate
Class: Copper-binding tripeptide / matricellular signaling peptide (copper tripeptide complex)

How does GHK-Cu work?

GHK-Cu is thought to act as a matricellular signaling molecule that helps deliver copper into cells and modulates skin-remodeling pathways. In laboratory and animal models it stimulates synthesis of collagen, glycosaminoglycans, and the proteoglycan decorin while balancing matrix metalloproteinases against their inhibitors (TIMP-1/TIMP-2), supporting controlled tissue remodeling. It also shows antioxidant activity (quenching lipid-peroxidation byproducts and supplying copper to protective enzymes) and anti-inflammatory effects (reducing cytokines such as TNF-alpha-driven IL-6 and TGF-beta in fibroblast cultures). Gene-expression studies report broad modulation of human genes (one analysis found ~31% of genes changed by 50% or more), and it can increase epidermal stem-cell markers such as integrins and p63 in cell models.

What has GHK-Cu been studied for?

Visible skin aging (fine lines, firmness, skin density/thickness, clarity) in topical cosmetic use
Skin barrier support and post-procedure skin appearance/recovery (topical)
Wound healing and tissue repair (predominantly in vitro and animal models)
Hair follicle / hair-related effects (early, limited data)
Antioxidant and anti-inflammatory activity in skin (mechanistic, mostly preclinical)

What does the evidence show?

Evidence is strongest at the mechanistic level: extensive in vitro (cell-culture) and animal data (rodent, rabbit, pig, dog) support collagen stimulation, MMP/TIMP modulation, antioxidant and anti-inflammatory actions, and gene-expression changes, much of it summarized in review articles by Pickart and colleagues. Human evidence is mostly limited to small cosmetic facial studies (roughly 40-70 participants) reporting improvements in fine lines, skin density, and appearance with topical use. Important caveats: many human trials are small, industry-adjacent, and short-term; broad "resets thousands of genes / reverses aging" framing comes largely from gene-array and review literature and is not equivalent to proven clinical benefit; wound-healing and hair claims rest mainly on preclinical work. Long-term topical safety is reassuring from decades of cosmetic use, but large rigorous randomized human trials are sparse, and systemic/injected use is not established in humans.

What is known about the safety of GHK-Cu?

Topical cosmetic use has a long track record and is generally well tolerated; reviews describe no adverse effects reported over decades of cosmetic and human wound-healing use at typical concentrations. Possible issues with topical use include local irritation, redness, itching, or contact sensitivity, and people with copper allergy should avoid it. Because the molecule carries copper, a theoretical concern is copper accumulation with excessive or very high-concentration use; this is not a documented problem at cosmetic levels but argues against overuse. Animal data indicate a wide safety margin (systemic effects far below toxic doses), but injected/systemic human use is not well characterized and should be considered investigational. As with any active, patch-testing and introducing it gradually is sensible, and it should not be applied to broken or compromised skin without clinician guidance.

What is the legal status of GHK-Cu?

Legal as a cosmetic ingredient. Under the INCI name "Copper Tripeptide-1," GHK-Cu is widely and lawfully used in topical skincare (serums, creams). In the US, cosmetics are regulated under the Federal Food, Drug, and Cosmetic Act and do not require FDA pre-market approval, but the product may only make appearance/cosmetic claims (e.g., "improves the look of fine lines") and not drug claims (e.g., "treats wrinkles," "heals wounds"). GHK-Cu is NOT FDA-approved as a drug, and injectable GHK-Cu is not an FDA-approved therapy. It is not a controlled substance and is not a WADA-banned substance for topical cosmetic use.

What is the half-life of GHK-Cu?

As a free peptide in plasma, GHK has a very short half-life (on the order of minutes), because it is rapidly cleaved by aminopeptidases and carboxypeptidases; the copper ion released is taken up by carriers such as albumin and ceruloplasmin. In topical/wound environments it is similarly susceptible to enzymatic breakdown, which is why cosmetic formulation and stabilization matter. Reported downstream gene-expression and remodeling effects in cell studies can persist beyond the time the peptide itself remains intact. Precise human pharmacokinetic half-life values are not well established and reported figures vary across sources.

Where to find GHK-Cu at Peppies

Sources

From the Peppies Peptide Intelligence Library: an educational summary of the published literature, not medical advice. No dosing, preparation or administration instructions are given on these pages. Last updated 2026-09-24. Corrections: support@peppies.eu.