GHK-Cu
A naturally occurring copper-binding tripeptide studied for skin regeneration, wound healing, hair growth, and gene expression modulation.
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What is GHK-Cu?
GHK-Cu is a naturally occurring tripeptide-copper complex consisting of glycyl-L-histidyl-L-lysine (GHK) bound to a divalent copper ion. The GHK peptide was first isolated from human plasma in 1973 by Loren Pickart, who observed that its levels appeared to be involved in age-related changes in regenerative capacity. The peptide naturally chelates copper with high affinity, and the GHK-Cu complex (rather than free GHK) is the biologically active form responsible for most documented effects on tissue repair, gene expression, and cellular signaling.
GHK-Cu is among the most extensively studied peptides in cosmetic and dermatological research, with thousands of published studies examining effects on skin, hair, wound healing, and broader tissue regeneration. The peptide is permitted as a cosmetic ingredient in most major jurisdictions and has been investigated in research contexts examining gene expression modulation, where analyses have suggested influence on the expression of thousands of human genes, predominantly resetting expression patterns toward those observed in younger tissues.
Mechanism of action
GHK-Cu’s mechanisms of action have been investigated across multiple pathways:
- Copper delivery and signaling: The peptide functions as a copper-delivery system, bringing copper into cells where it serves as a cofactor for enzymes including lysyl oxidase (collagen cross-linking), superoxide dismutase (antioxidant defense), and cytochrome c oxidase (mitochondrial respiration).
- Gene expression modulation: Microarray studies have shown modulation of expression of thousands of human genes, with effects favoring upregulation of DNA repair, antioxidant, and tissue regeneration pathways and downregulation of inflammatory and certain age-related pathways.
- Collagen and extracellular matrix synthesis: Research has documented stimulation of collagen, elastin, and glycosaminoglycan production in dermal fibroblasts.
- Anti-inflammatory and antioxidant effects: Studies have shown reductions in pro-inflammatory cytokines (TNF-α, IL-1, IL-6) and increases in antioxidant enzyme expression.
- Wound healing: Preclinical models have documented chemotaxis of macrophages and mast cells to wound sites, stimulation of angiogenesis, and enhanced extracellular matrix production.
These pathways are characterized in both preclinical models and human dermatological research.
Research applications
GHK-Cu has been investigated across several research domains, with the most active areas including:
- Cosmetic and dermatological research: GHK-Cu is one of the most widely used active ingredients in topical anti-aging research. Studies have documented effects on skin firmness, elasticity, fine line reduction, hyperpigmentation, and photodamage in both controlled studies and consumer research.
- Wound healing research: Animal models and clinical studies have examined effects on diabetic ulcers, surgical wounds, pressure ulcers, and burns, with generally favorable findings on healing rate, tissue quality, and scar formation.
- Hair growth research: Studies have examined effects on hair follicle biology, including dermal papilla cell function, hair shaft elongation, and prevention of follicular miniaturization in androgenetic alopecia models.
- Systemic regenerative research: Beyond topical applications, research has examined effects of injected GHK-Cu in models of lung injury, cognitive aging, and metabolic dysfunction, with effects on inflammatory markers and tissue repair pathways.
- Gene expression and anti-aging research: Bioinformatic analyses have characterized GHK’s effects on thousands of human genes, with patterns suggesting reversal of certain age-associated and disease-associated expression signatures.
This compound is intended for laboratory research use only. It has not been approved for human therapeutic use by any regulatory agency.
Storage & reconstitution
In its lyophilized form, GHK-Cu tolerates ambient temperatures during shipping but should be stored long-term at -20°C, protected from light. The compound is sensitive to light and pH extremes. Properly stored lyophilized peptide remains stable for 24 months or longer.
Once reconstituted with bacteriostatic water for injection, GHK-Cu solutions should be stored refrigerated at 2-8°C and used within 28 days. Neutral to slightly acidic pH conditions help maintain copper-peptide complex stability. Avoid repeated freeze-thaw cycles, which can degrade peptide structure and reduce activity.
Visual inspection should be performed before each use. The reconstituted solution should be clear with a light blue tint characteristic of the copper complex. Reject any solution that appears cloudy, has unusual discoloration, or contains visible particulate matter.
For step-by-step reconstitution calculations, see our reconstitution calculator.
For laboratory research use only. The compound described on this page is intended exclusively for in vitro research and laboratory experimentation by qualified researchers and is not for human or veterinary use. It is not a drug, food, dietary supplement, or cosmetic, and has not been approved by the FDA, Health Canada, EMA, or any other regulatory authority for the diagnosis, treatment, cure, mitigation, or prevention of any disease or medical condition. The information provided on this page is for educational and reference purposes only and does not constitute medical advice. By accessing this content you confirm that you are a qualified researcher purchasing for legitimate laboratory purposes.