GHK-Cu — glycyl-L-histidyl-L-lysine copper complex — is one of the most studied naturally occurring peptides in human biology. Unlike many research peptides that are fully synthetic, GHK-Cu is a tripeptide that occurs naturally in human plasma, urine, and saliva, and has been the subject of scientific investigation for over five decades. Its interaction with copper ions and its wide range of observed biological activities have made it a particularly rich area of research.
What Is GHK-Cu?
GHK-Cu consists of the tripeptide GHK (glycyl-L-histidyl-L-lysine) complexed with a copper (II) ion. The copper component is essential to its biological activity — the peptide acts as a copper carrier, delivering copper to cells and tissues in a bioavailable form. Copper is a critical cofactor for numerous enzymes involved in collagen synthesis, antioxidant defense, and tissue remodeling.
The peptide was first isolated from human plasma albumin by Dr. Loren Pickart in 1973, and subsequent decades of research have expanded understanding of its role in wound healing, skin biology, and gene expression regulation.
| Property | Detail |
|---|---|
| Full name | Glycyl-L-histidyl-L-lysine copper (II) complex |
| Molecular weight | ~340 Da (tripeptide) + copper |
| Natural occurrence | Human plasma, urine, saliva |
| CAS number | 89030-95-5 |
| Typical form | Lyophilized powder or solution |
Studied Mechanisms of Action
Copper delivery and enzyme activation. GHK-Cu’s primary mechanism involves delivering bioavailable copper to cells. Copper is required for lysyl oxidase, an enzyme critical to collagen and elastin crosslinking — the process that gives connective tissue its structural integrity. Copper is also a cofactor for superoxide dismutase (SOD), a key antioxidant enzyme.
Collagen and glycosaminoglycan synthesis stimulation. Research has demonstrated that GHK-Cu stimulates the synthesis of collagen, elastin, and glycosaminoglycans (such as hyaluronic acid) in fibroblast cultures. These are the structural components of skin and connective tissue, and their production declines significantly with age.
Wound healing acceleration. Multiple studies have documented GHK-Cu’s ability to accelerate wound contraction and re-epithelialization in animal models. It appears to attract immune cells and fibroblasts to wound sites and stimulate the production of growth factors including TGF-β.
Anti-inflammatory activity. GHK-Cu has been shown to suppress the production of pro-inflammatory cytokines including TNF-α and IL-6, while upregulating anti-inflammatory pathways. This dual role — promoting repair while suppressing damaging inflammation — is considered central to its observed effects in tissue models.
Gene expression modulation. Perhaps the most striking finding in GHK-Cu research is its apparent ability to modulate the expression of a large number of genes. Studies by Pickart and colleagues identified over 4,000 human genes that GHK-Cu appears to influence, including genes involved in DNA repair, antioxidant defense, and mitochondrial function. This breadth of gene expression activity has made GHK-Cu a subject of interest in aging biology research.
Research Applications
GHK-Cu has been studied across several distinct research domains:
Skin biology and anti-aging research. The majority of published GHK-Cu research focuses on skin. Studies have documented its effects on dermal fibroblast activity, collagen density, skin thickness, and the reduction of oxidative damage markers. It is one of the most studied compounds in the field of skin aging research.
Wound healing models. Animal studies have consistently shown accelerated wound closure and improved tissue quality in GHK-Cu treated groups compared to controls. Research has examined both topical and systemic administration routes.
Hair follicle research. Studies have examined GHK-Cu’s effects on hair follicle size and hair growth in animal models, with some findings suggesting stimulation of follicle activity.
Lung tissue research. More recent research has examined GHK-Cu in the context of lung fibrosis and COPD models, with findings suggesting potential anti-fibrotic activity.
Neurological research. Emerging research has begun examining GHK-Cu’s potential neuroprotective effects, based on its gene expression modulation activity and antioxidant properties.
Sourcing and Quality Standards
GHK-Cu is a relatively small, stable peptide, but quality still varies significantly between suppliers. Researchers should look for vendors providing HPLC purity data (≥98% minimum, ≥99% preferred), mass spectrometry confirmation of the copper complex, and batch-specific COA documentation.
One important consideration: some suppliers sell GHK (the tripeptide without copper) rather than GHK-Cu (the copper complex). These are different compounds with different properties. Researchers should confirm they are receiving the copper-complexed form if that is what their protocol requires.
Wellington Reserve stocks GHK-Cu at ≥99% purity with full third-party COA documentation available at wellingtoncompounds.com.
Important Research Disclaimer
GHK-Cu is sold strictly for research purposes. It is not intended for human consumption and is not approved by the FDA for therapeutic use. All research should be conducted by qualified researchers in appropriate laboratory settings.
Wellington Reserve supplies research-grade GHK-Cu and a full catalog of peptides at ≥99% purity. Third-party tested, COA-verified. Visit wellingtoncompounds.com.