GHK-Cu (Copper Peptide)
GHK-Cu is a naturally occurring copper-binding tripeptide with a growing body of research supporting its role in skin repair, wound healing, and anti-aging applications.
What is GHK-Cu?
GHK-Cu (glycyl-L-histidyl-L-lysine copper) is a tripeptide that naturally occurs in human plasma, saliva, and urine. First isolated in the early 1970s, it was found to promote the survival and growth of liver cells. Its strong affinity for copper (Cu²⁺) is central to many of its proposed biological activities. Levels of GHK-Cu in the body decline with age — from roughly 200 ng/mL at age 20 to around 80 ng/mL by age 60 — which has fueled interest in exogenous supplementation as a potential anti-aging strategy.
In research settings, GHK-Cu is most often studied in topical form for skin applications, though injectable preparations are also available from research-grade suppliers. It is not approved by the FDA for any therapeutic use.
Research Overview
The bulk of published GHK-Cu research is preclinical (cell culture and animal models). Human clinical data is limited but emerging, primarily in the context of topical skincare formulations.
- Wound healing: Multiple in vitro and animal studies demonstrate that GHK-Cu accelerates wound closure, increases collagen and glycosaminoglycan synthesis, and stimulates angiogenesis (new blood vessel formation).
- Skin remodeling: Topical GHK-Cu has been shown in small human trials to improve skin elasticity, reduce fine lines, and increase dermal density after 12 weeks of use compared to placebo.
- Gene expression:Lunde & Gould (2018) and follow-up analyses suggest GHK-Cu modulates expression of over 4,000 genes, including upregulation of antioxidant and tissue-repair pathways and downregulation of inflammation-related genes.
- Hair growth: Some animal and in vitro data suggest GHK-Cu may stimulate hair follicle proliferation, though robust human evidence is currently lacking.
Potential Benefits
Based on preclinical and limited clinical evidence. Not medical claims.
- Supports collagen and elastin production in skin
- May accelerate wound and tissue repair
- Antioxidant activity via copper chelation
- Potential reduction in skin photoaging markers
- Possible hair follicle stimulation
- Anti-inflammatory effects in cellular models
How It's Used
These are community-reported and research-context protocols only. Not medical advice. Consult a healthcare professional.
Topical
The most studied delivery route. Concentrations in research formulations typically range from 0.1% to 1% GHK-Cu. Applied once or twice daily to clean skin. This is the only form with meaningful human clinical data.
Subcutaneous Injection (Research Context)
Some researchers use injectable GHK-Cu at doses ranging from 1–2 mg per injection, administered subcutaneously. Injection site delivery is thought to allow more direct tissue exposure than systemic circulation. Long-term safety data for injectable use in humans is not established.
What We Don't Know
- Optimal systemic dosing and frequency for injectable use in humans has not been established in clinical trials.
- Long-term safety profile for injectable GHK-Cu is unknown.
- Whether the broad gene-expression effects seen in vitro translate meaningfully to in vivo human outcomes is not confirmed.
- Bioavailability of topically applied GHK-Cu through intact skin remains debated.
- Interaction profile with other peptides or pharmaceuticals is poorly characterized.
Related Reading
Disclaimer
The information on this page is for educational and informational purposes only. It is not intended as medical advice. We are not medical professionals. All compounds discussed are intended for research purposes only. Always consult with a qualified healthcare professional before making any decisions about peptides or supplements. Individual results may vary. See our full disclaimer.
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