Journal September 16, 2026 5 min read

What is GHK-Cu?

GHK-Cu is a copper-binding tripeptide studied in laboratory models of wound repair, inflammation, and skin biology. This article summarises the research evidence, including where findings are animal-only or in vitro.

peptides-pro Editorial

GHK-Cu is the copper(II) complex of the tripeptide glycyl-L-histidyl-L-lysine (GHK). It is also referred to as copper peptide, glycyl-L-histidyl-L-lysine copper(II), or GHK-copper. The peptide sequence is Gly-His-Lys, and the copper ion is coordinated by the histidine imidazole nitrogen and the terminal amino group. The molecular formula of the complex is C14H22CuN6O4, with a molecular weight of approximately 402.9 g/mol. GHK occurs naturally in human plasma and urine [11]. In research settings, GHK-Cu is supplied as a lyophilised powder for laboratory use.

Research on GHK-Cu centres on its interactions with copper-dependent signalling and inflammatory pathways, including the SIRT1/STAT3 axis in models of colitis [6] and the DAF-16/SKN-1 pathways in Caenorhabditis elegans [11]. The sections below summarise specific studies by model and mechanism.

Research Studies

GHK-Cu and circulating GHK levels in healthy adults

A two-part clinical trial is investigating changes in circulating GHK and GHK-Cu blood levels in healthy adults following application of an X39 patch compared with a placebo patch. The study measures the change from baseline to Day 8 and compares the difference between active and placebo groups. Participants complete a questionnaire and use the assigned patch [1]. This trial is ongoing; no results are available in the evidence block.

GHK-Cu and Th2 cytokines in keratinocyte models of atopic dermatitis

A complex of Torilis japonica extract and GHK-Cu was formulated and tested in a TNF-α/IFN-γ-stimulated keratinocyte model of atopic dermatitis. The complex attenuated Th2 cytokine production and promoted keratinocyte recovery, suggesting a potential antioxidant strategy for atopic dermatitis [2]. This is an in vitro study; no human data are reported.

GHK-Cu and behavioural rescue in middle-aged mice

Middle-aged mice treated with GHK-Cu administered intraperitoneally or intranasally showed behavioural rescue, but the two routes of administration produced divergent hippocampal aging programs [3]. This is an animal study; the findings have not been confirmed in humans.

GHK-Cu and laccase-like activity for phenolic sensing

GHK-Cu was found to possess laccase-like catalytic activity. In enzymatic kinetics assays, GHK-Cu had a Vmax of 1.735 × 10^-4 mM·s^-1 and a Km of 0.061 mM, indicating good substrate affinity and catalytic efficiency. A colorimetric method based on this activity was developed for detection of epinephrine (EP) and 2-aminophenol (2-AP). The linear response range for EP was 20–240 μM with a limit of detection (LOD) of 9.5 μM; for 2-AP, the linear range was 14–100 μM [4]. This is an in vitro analytical chemistry study.

GHK-Cu and acute skin wound healing in healthy adults

A clinical trial is evaluating whether a topical gel containing GHK-Cu can safely speed up healing of small, standardised skin wounds in healthy adults compared with a matching vehicle gel. Participants receive two small punch-biopsy wounds on the upper arm; each wound is randomly assigned to receive GHK-Cu gel or vehicle gel under identical dressings. Wounds are photographed and assessed over 3 weeks, with a follow-up visit to evaluate scar quality [5]. This trial is ongoing; no results are available in the evidence block.

GHK-Cu and colitis in a murine model

In a dextran sulfate sodium (DSS)-induced murine model of ulcerative colitis, GHK-Cu was evaluated for therapeutic potential, with emphasis on its regulatory effects on the NAD-dependent deacetylase sirtuin-1 (SIRT1)/signal transducer and activator of transcription 3 (STAT3) signalling pathway. The study aimed to systematically assess the mechanisms underlying GHK-Cu's anti-inflammatory properties in this model [6]. This is an animal study; the findings have not been confirmed in humans.

GHK-Cu and skin permeation from liposomal formulations

A review discusses the challenge of skin permeation for GHK-Cu, a hydrophilic compound with limited penetration through the lipophilic stratum corneum. Liposomes capable of encapsulating GHK-Cu may improve its permeation potential [7]. This is a review article; no primary experimental data are reported in the evidence block.

GHK-Cu in gerontological peptide research

A narrative review of therapeutic peptides in gerontology examined mechanisms, clinical applications, evidence base, and safety profiles of peptides with demonstrated or potential applications in healthy aging and age-related conditions. The review covered hallmarks of aging including metabolic dysfunction, telomere attrition, tissue repair impairment, and hormonal decline [8]. GHK-Cu is one of the peptides discussed in this broader context.

GHK-Cu in preclinical models of regeneration and inflammation

Preclinical models have reported regenerative, anti-inflammatory, and antioxidant properties for GHK-Cu, prompting its increasing integration into aesthetic medicine research [9]. In zebrafish larvae, GHK-Cu attenuated inflammation induced by copper sulfate (CuSO4) or lipopolysaccharide (LPS) [12]. In Caenorhabditis elegans, GHK-Cu delayed aging via coordinated regulation of mitochondrial function and activation of DAF-16/SKN-1 pathways [11]. These are animal and invertebrate model findings; they have not been confirmed in humans.

GHK-Cu in cosmetic formulation research

A study investigated the skin beneficial effects of a mixed-culture ferment extract from Thermus thermophilus and Bacillus subtilis combined with the tripeptide GHK-Cu. The research aimed to explore whether targeting multiple pathways simultaneously could counteract skin aging driven by chronic inflammation and UV exposure [10]. This is a formulation study; no human clinical outcomes are reported in the evidence block.

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