GHK-Cu: Copper Tripeptide-1
A naturally occurring copper-bound tripeptide studied for wound healing, collagen synthesis, and tissue regeneration.
Quick Reference
| Research Dosage | 1-2mg per day |
|---|---|
| Frequency | Once daily |
| Administration | Subcutaneous injection |
| Cycle Length | 4-8 weeks typical |
| Reconstitution | 2mL bacteriostatic water per vial |
| Storage | Refrigerate after reconstitution, use within 4-6 weeks |
GHK-Cu stands apart from other research peptides – it's naturally occurring, found in human plasma, saliva, and urine. This isn't a synthetic creation but a molecule your body already produces. What makes it research-worthy is the dramatic decline with age: plasma levels drop from approximately 200 ng/mL at age 20 to around 80 ng/mL by age 60 – a 60% reduction.
Since its discovery in 1973 by Dr. Loren Pickart, GHK-Cu has become one of the most extensively studied peptides for tissue remodelling and gene expression. Over 4,000 human genes have been identified that GHK-Cu influences – many involved in tissue repair, antioxidant defence, inflammation control, and regeneration.
The copper ion (Cu²⁺) is not incidental – it's essential. The copper gives GHK-Cu its characteristic blue colour and is required for biological activity. GHK alone has some effects, but GHK-Cu (the copper complex) is far more potent because copper is integral to its mechanism of action.
Research Applications
GHK-Cu is studied across multiple research domains due to its broad biological activity:
Wound Healing Research
GHK-Cu is extensively studied for wound healing through multiple mechanisms:
- Attracts immune cells (macrophages) and fibroblasts to wound sites
- Stimulates collagen synthesis (types I and III)
- Promotes glycosaminoglycan synthesis (GAGs for extracellular matrix)
- Stimulates angiogenesis (new blood vessel formation)
- Accelerates wound contraction and closure
- Modulates inflammatory response to optimal levels
Research findings include accelerated wound closure in multiple animal models, improved healing in diabetic wound models where healing is typically impaired, enhanced surgical wound repair, reduced scarring and fibrosis, and better tissue remodelling outcomes.
Skin and Collagen Research
Collagen and elastin effects documented in research:
- Stimulates collagen I and III synthesis in fibroblasts
- Increases elastin production
- Improves extracellular matrix composition
- Enhances skin density and firmness
- Reverses age-related thinning of skin
- Improves skin elasticity
- Reduces fine lines through collagen effects
These findings form the research basis for cosmeceutical applications and have led to widespread use in skincare formulations.
Gene Expression Research
GHK-Cu's gene expression profile is extraordinary – affecting 4,000+ genes:
Genes Upregulated:
- Collagen genes (COL1A1, COL3A1, COL5A1)
- Elastin genes (ELN)
- Antioxidant enzymes (SOD1, SOD2, SOD3, GPX)
- DNA repair genes
- Neurotrophic factors (NGF, VEGF)
- Anti-inflammatory genes
Genes Downregulated:
- Pro-inflammatory genes (IL-6, TNF-alpha)
- Matrix metalloproteinases (controlled degradation)
- Pro-fibrotic genes
- Genes promoting scar tissue formation
This broad gene regulation underlies GHK-Cu's diverse biological effects.
Hair Follicle Research
- Follicle enlargement documented in studies
- Extended growth phase (anagen)
- Increased hair thickness
- May activate stem cells in follicle bulge region
- Ongoing hair loss research applications
Antioxidant Research
- Upregulates antioxidant enzyme genes
- Copper itself has antioxidant properties
- Protects against oxidative damage
- May contribute to anti-aging effects through reduced oxidative stress
Dosage Information
Standard Research Dosages
Dosages commonly referenced in research literature range from 1-2mg daily via subcutaneous injection. This dosage range appears to effectively restore GHK-Cu levels that decline with age.
Administration
GHK-Cu is typically administered via subcutaneous injection once daily. The peptide demonstrates systemic effects regardless of injection site. For localised skin research, some protocols administer injections proximal to the target area.
Topical Research
GHK-Cu is also studied topically, where it is listed as Copper Tripeptide-1 in cosmetic formulations (INCI name). Topical and injectable applications represent distinct research areas with different protocols and concentrations.
Cycle Duration
Research protocols typically range from 4-8 weeks. Given that GHK-Cu is a naturally occurring peptide that declines with age, some researchers investigate longer-term protocols. However, standard peptide research methodology includes break periods of 2-4 weeks between cycles.
Reconstitution Guide
Required Materials
- GHK-Cu lyophilised powder (50mg vial)
- Bacteriostatic water (water containing 0.9% benzyl alcohol)
- Sterile insulin syringe for reconstitution
- Alcohol swabs for sterile technique
Reconstitution Steps
- Allow the GHK-Cu vial to reach room temperature before reconstitution
- Draw 2mL of bacteriostatic water into the syringe
- Insert the needle into the GHK-Cu vial and direct the stream of water down the inside wall of the vial – do not spray directly onto the powder
- Allow the powder to dissolve naturally without shaking. Gentle swirling is acceptable if needed. GHK-Cu dissolves readily in water.
- Verify the solution has a slight blue tint – this is characteristic of the copper-peptide complex and indicates proper reconstitution. Colorless solution may indicate quality issues.
- Store reconstituted solution refrigerated at 2-8°C immediately after reconstitution
Concentration Reference Table
| Vial Size | Water Added | Concentration | 1mg Dose | 2mg Dose |
|---|---|---|---|---|
| 50mg | 2mL | 25mg/mL | 4 units (0.04mL) | 8 units (0.08mL) |
| 50mg | 2.5mL | 20mg/mL | 5 units (0.05mL) | 10 units (0.1mL) |
Storage Guidelines
Lyophilised (Powder) Form
- Appears as blue/purple powder due to copper content
- Stable at room temperature for several weeks without significant degradation
- Refrigeration (2-8°C) extends stability to 12+ months
- Freezing (-20°C) extends stability to 24+ months
- Protect from light and moisture
- Keep vial sealed until ready for reconstitution
Reconstituted Solution
- Should have slight blue tint – colorless indicates potential issues
- Must be refrigerated at 2-8°C
- Stable for 4-6 weeks when stored correctly
- Do not freeze after reconstitution – freezing can damage the peptide structure
- Avoid repeated temperature fluctuations
- Use sterile technique when drawing doses to prevent contamination
- If solution becomes cloudy or contains particles, discard and reconstitute a fresh vial
Frequently Asked Questions
Common questions about GHK-Cu research
Is GHK-Cu a natural peptide?
Yes. GHK-Cu is found naturally in human plasma, saliva, and urine. Research uses synthesized GHK-Cu identical to the natural molecule. Plasma levels decline from approximately 200 ng/mL at age 20 to around 80 ng/mL by age 60 – a 60% reduction that correlates with decreased regenerative capacity.
Why does GHK-Cu have a blue color?
The copper ion (Cu²⁺) gives GHK-Cu its characteristic blue/purple color. This is normal for copper-peptide complexes. If reconstituted GHK-Cu is colorless, it may indicate missing or unbound copper, which would significantly reduce biological activity.
How does GHK-Cu affect so many genes?
GHK-Cu appears to modulate master transcription factors that control large gene networks, rather than affecting each gene individually. Research has identified over 4,000 human genes influenced by GHK-Cu, including those involved in tissue repair, antioxidant defense, inflammation control, and regeneration.
Why does GHK-Cu decline with age?
The mechanism behind age-related GHK-Cu decline is not fully understood, but the decline correlates with reduced regenerative capacity, slower wound healing, skin aging, and decreased antioxidant defense in elderly individuals. This natural decline forms the basis for research into GHK-Cu supplementation.
What is the role of copper in GHK-Cu?
The copper ion is essential for GHK-Cu biological activity. The histidine residue coordinates the copper ion, forming a stable 1:1 Cu²⁺ complex. Copper is a cofactor for many enzymes including lysyl oxidase (collagen cross-linking) and superoxide dismutase (antioxidant). GHK alone has some effects, but GHK-Cu is far more potent.
Can GHK-Cu be used topically?
Yes. GHK-Cu is also studied topically, listed as Copper Tripeptide-1 in cosmetics (INCI name). Topical and injectable applications are distinct research areas with different protocols. Topical use is common in cosmeceutical formulations for skin research.
What is the molecular weight of GHK-Cu?
GHK-Cu has a molecular weight of 403.92 g/mol (Daltons), with approximately 16% of that weight from the copper ion.
How should reconstituted GHK-Cu appear?
Reconstituted GHK-Cu should have a slight blue tint, which is characteristic of the copper-peptide complex. If the solution is colorless, the copper may not be properly complexed, indicating a potential quality issue. The lyophilised powder itself appears blue/purple.
The Science: How GHK-Cu Works
Copper Binding Mechanism
GHK (Gly-His-Lys) binds copper with high affinity through the histidine residue:
- The histidine imidazole ring coordinates the copper ion
- Forms a stable 1:1 Cu²⁺ complex
- Copper is essential for biological activity – GHK alone is far less potent
- Delivers bioavailable copper to cells
- Copper is a cofactor for many enzymes including lysyl oxidase and superoxide dismutase
Multi-Factorial Mechanism
GHK-Cu doesn't work through a single receptor. Instead, it operates through multiple pathways:
- Gene Expression Modulation: Affects transcription factors regulating thousands of genes involved in repair, inflammation, and regeneration
- Copper Delivery: Provides copper for enzymatic functions including lysyl oxidase (collagen cross-linking), superoxide dismutase (antioxidant), and cytochrome c oxidase (cellular respiration)
- Cell Signaling: Activates pathways related to tissue repair and regeneration
- Matrix Remodelling: Stimulates production and organisation of extracellular matrix components including collagen, elastin, and glycosaminoglycans
Age-Related Decline
The natural decrease in plasma GHK-Cu with age may contribute to:
- Slower wound healing in elderly individuals
- Reduced regenerative capacity
- Skin aging and loss of elasticity
- Decreased antioxidant defence
Restoring GHK-Cu levels is a logical research direction based on this documented decline.
Amino Acid Sequence and Structure
Sequence: Gly-His-Lys + Cu²⁺
| Position | Amino Acid | Role |
|---|---|---|
| 1 | Gly (G) | N-terminus, provides flexibility |
| 2 | His (H) | Copper coordination (key residue) |
| 3 | Lys (K) | Positive charge, stability |
| - | Cu²⁺ | Copper ion bound to histidine |
The histidine imidazole ring is critical for copper binding. The copper content is approximately 16% by weight of the complete complex.
Technical Specifications
| Systematic Name | Glycyl-L-histidyl-L-lysine:copper(II) |
|---|---|
| Other Names | Copper Peptide, Copper Tripeptide-1, GHK Copper, GHK-Copper, Blue Copper Peptide, Copper GHK, Tripeptide-Copper Complex |
| Amino Acid Count | 3 |
| Sequence | GHK-Cu²⁺ |
| Molecular Formula | C₁₄H₂₃N₆O₄Cu |
| Molecular Weight | 403.92 g/mol |
| CAS Number | 49557-75-7 |
| Isoelectric Point | N/A (metal complex) |
| Net Charge (pH 7) | +1 (at physiological pH) |
| Appearance | White to off-white lyophilised powder |
| Solubility | Freely soluble in water and aqueous buffers |
| Purity (PurposeLabs) | ≥99% (HPLC verified) |
| Storage (Lyophilised) | -20°C long-term, 2-8°C short-term |
| Storage (Reconstituted) | 2-8°C, use within 4-6 weeks |
Quality: Australian University Testing
Why Peptide Quality Matters
The research peptide market contains products of highly variable quality. Independent testing of products from various suppliers has revealed significant issues:
- Purity levels as low as 50% in products claiming "99% purity"
- Incorrect amino acid sequences (entirely wrong peptides)
- Truncated sequences (missing amino acids)
- Bacterial endotoxin contamination
- Oxidised or degraded peptides with reduced activity
Our Testing Protocol
Every batch of GHK-Cu from PurposeLabs undergoes comprehensive testing at a leading proteomics laboratory based at an Australian university in Sydney – one of Australia's premier analytical facilities.
Confirms purity levels of ≥99%, identifies any impurities or degradation products.
Verifies exact molecular weight, confirms correct amino acid sequence.
Determines actual peptide content versus salt, moisture, and counter-ions.
Why Australian University Testing?
Our testing partner is an established, verifiable proteomics facility at a major Australian university, with published research credentials, transparent methodology, and no commercial conflict of interest. This contrasts with overseas "certificates of analysis" from unknown or unverifiable laboratories.
Shop GHK-Cu
Australian university tested. 99%+ purity verified by HPLC and mass spectrometry. Fast shipping from Sydney.
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References
Key studies for researchers seeking primary literature:
- Pickart L. "The human tri-peptide GHK and tissue remodeling." Journal of Biomaterials Science, Polymer Edition, 2008.
- Pickart L, Margolina A. "Regenerative and protective actions of the GHK-Cu peptide in the light of the new gene data." International Journal of Molecular Sciences, 2018.
- Pollard JD, et al. "Synthetic GHK peptide enhances wound healing in diabetic mice." Wound Repair and Regeneration, 2005.
- Pickart L, Vasquez-Soltero JM, Margolina A. "GHK peptide as a natural modulator of multiple cellular pathways in skin regeneration." BioMed Research International, 2015.
- Maquart FX, et al. "Stimulation of collagen synthesis in fibroblast cultures by the tripeptide-copper complex glycyl-L-histidyl-L-lysine-Cu2+." FEBS Letters, 1988.
- Siméon A, et al. "Expression of glycosaminoglycans and small proteoglycans in wounds: modulation by the tripeptide-copper complex glycyl-L-histidyl-L-lysine-Cu(2+)." Journal of Investigative Dermatology, 2000.
- Gul NY, et al. "The comparison of nail bed repair and skin grafting in a rat model." Turkish Journal of Medical Sciences, 2008.
- Canapp SO Jr, et al. "The anti-inflammatory effects of GHK-Cu in acute and chronic inflammatory conditions." Archives of Facial Plastic Surgery, 2003.
Disclaimer
All products sold by PurposeLabs are intended for laboratory and research use only. They are not intended for human or animal consumption. The information provided is for educational purposes only and should not be construed as medical advice. Consult with qualified healthcare professionals for any health-related decisions.
GHK-Cu is not approved by the TGA for therapeutic use in Australia. Products are sold strictly for research purposes in accordance with Australian regulations.