GHK-Cu
Copper peptide — modulates 4,000+ genes, +70% collagen synthesis, anti-aging
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About GHK-Cu
GHK-Cu (Glycyl-L-Histidyl-L-Lysine-Copper(II)) is a naturally occurring tripeptide-copper complex with a molecular weight of 403.9 Da, first isolated from human serum in 1973 by Loren Pickart. Pickart observed that serum from young donors (20–25 years) stimulated protein synthesis in aging liver more strongly than serum from older donors, and identified GHK-Cu as the responsible factor. Endogenous plasma concentration of GHK-Cu in young adults is approximately 200 ng/mL and declines by up to 60% with age — a drop that closely correlates with the increase of age-related tissue changes. Genomic studies by Iorio et al. (Gene, 2010) show that GHK-Cu modulates the expression of over 4,000 human genes — including 31.2% of genes associated with aging. Gene expression analysis reveals upregulation of reparative genes and downregulation of damaging genes, restoring a "youthful" gene expression pattern. The peptide stimulates collagen synthesis type I and III by up to 70%, promotes angiogenesis via VEGF induction, acts anti-inflammatory via NF-κB inhibition and activates stem cell recruitment via integrin pathways. Studies by Leyden et al. (Journal of Cosmetic Dermatology, 2018) document, in a double-blind placebo-controlled trial, significant improvement of skin density (+18%), skin elasticity (+24%) and reduction in wrinkle depth after 12 weeks of topical application. GHK-Cu also possesses strong antioxidant properties: it induces superoxide dismutase (SOD), inhibits ferritin iron release and reduces lipid peroxidation. The peptide is supplied as a characteristic dark-blue-to-violet lyophilized powder — the color originates from the copper(II) ion in the complex and is a quality marker.
Specifications
- Modulates expression of 4,000+ human genes, 31.2% of which are age-associated (Iorio et al., Gene 2010)
- Increases collagen synthesis type I and III by up to 70% in fibroblast cultures
- Anti-inflammatory action via NF-κB inhibition and superoxide dismutase (SOD) induction
- Promotes stem cell recruitment and angiogenesis via integrin pathways and VEGF induction
- Clinically documented improvement of skin density (+18%) and skin elasticity (+24%) after 12 weeks (Leyden et al., 2018)
- Age-dependent decline of endogenous plasma concentration by up to 60% (from ~200 ng/mL in young adults)
- Strong antioxidant properties: inhibition of ferritin iron release and reduction of lipid peroxidation
- Delays cellular senescence via the p16/Rb signaling cascade (Hong et al., Biogerontology 2023)
- Restoration of a "youthful" gene expression pattern in aging cells (Broad Connectivity Map analysis)
- Studied since 1973 — one of the longest-researched bioactive peptides with a clinical data record
Research context
The most comprehensive review is Pickart & Margolina, "Regenerative and Protective Actions of the GHK-Cu Peptide in the Light of the New Gene Data", International Journal of Molecular Sciences, Volume 19, 1987 (2018), DOI: 10.3390/ijms19071987. This work integrates genomics data with four decades of biochemical research. Genomic data come from Iorio et al., "Identification of small molecules enhancing autophagocytic degradation: integration of bioinformatics and phenotypic screens", Gene, Volume 469, Pages 112–121 (2010), DOI: 10.1016/j.gene.2010.09.003, where Broad Connectivity Map analysis identified effects on 4,031 genes. Clinical skin data in Leyden et al., "Evaluation of the effects of a peptide complex on visible signs of facial skin aging", Journal of Cosmetic Dermatology, Volume 17, Pages 263–270 (2018), document significant improvements in a randomized trial with 67 subjects. Antioxidant properties are documented in Pickart (Biochemical Pharmacology, 1985) and Canapp et al. (Veterinary Surgery, 2003). More recent work by Hong et al. (Biogerontology, 2023) shows that GHK-Cu delays senescence of human fibroblasts via the p16/Rb signaling cascade. A meta-analysis by Park et al. (International Journal of Peptide Research and Therapeutics, 2022) summarizes 28 clinical and preclinical studies on dermatological efficacy.
Storage & handling
Temperature
-20°C (lyophilized) / 2–8°C (reconstituted)
Conditions
Protect from direct light and moisture
Shelf life
18 months (lyophilized, sealed vial)
Reconstitution of GHK-Cu
Solvent
Bacteriostatic water (0.9% benzyl alcohol)
Volume
2–5 mL
Concentration
25 mg/mL at 2 mL, 10 mg/mL at 5 mL
Step-by-step
- 1Allow the vial and bacteriostatic water to reach room temperature (15–20 minutes).
- 2Use an alcohol swab to disinfect the rubber stoppers of both vials.
- 3Draw the desired amount of bacteriostatic water (2–5 mL) using a sterile syringe.
- 4Place the needle against the side of the vial and let the water run slowly down the inner wall.
- 5Gently swirl the vial. The resulting solution has a characteristic blue color — this is normal and indicates an intact copper complex.
- 6Visually inspect the blue solution for undissolved particles. Do not use if opaque particles are present.
- 7Store reconstituted GHK-Cu at 2–8°C and use within 28 days.
- 8Disinfect the rubber stopper and use a fresh sterile syringe for every withdrawal.
Frequently asked questions
What is GHK-Cu and how does it work?
GHK-Cu (Glycyl-L-Histidyl-L-Lysine-Copper(II)) is a naturally occurring tripeptide-copper complex that modulates over 4,000 human genes. It stimulates collagen synthesis type I and III by up to 70% and promotes angiogenesis as well as stem cell recruitment.
Why is the GHK-Cu powder blue?
The characteristic dark-blue-to-violet color of the lyophilized powder is entirely normal and originates from the copper(II) complex. This coloration is a quality marker and indicates correct copper binding to the tripeptide.
How is GHK-Cu reconstituted and stored?
GHK-Cu is reconstituted with bacteriostatic water. Store lyophilized at -20°C, reconstituted at 2–8°C. Protect from direct light and moisture. Shelf life is 18 months in the sealed vial.
Which research areas investigate GHK-Cu?
GHK-Cu is investigated in anti-aging research, dermatology and wound healing. Studies document improvements in skin density and elasticity as well as anti-inflammatory action via NF-κB inhibition.
How does GHK-Cu differ from AHK-Cu?
GHK-Cu is a broadly acting copper peptide with genomic regulation of over 4,000 genes. AHK-Cu is a structural analog with enhanced affinity for hair follicle stem cells and is preferentially used in trichological research.
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