GHK-Cu (glycyl-L-histidyl-L-lysine copper(II)) is a naturally occurring tripeptide-copper complex found in human plasma, saliva, and urine. It plays a role in tissue remodeling, wound healing, and skin regeneration. Unlike many research peptides, GHK-Cu has a decades-long research history and some clinical applications in dermatology and wound care.
| Property | Value |
|---|
| Peptide sequence | GHK (Gly-His-Lys) |
| Copper coordination | Cu²⁺ complex (1:1 molar ratio) |
| Molecular weight (peptide) | 340.38 Da |
| Molecular weight (complex) | 403.5 Da |
| Solubility | Water-soluble |
| Natural occurrence | Human plasma, saliva, urine, wound fluid |
GHK-Cu functions as a copper carrier and delivery system:
- Binds Cu²⁺ ions with high affinity at physiological pH
- Delivers copper to cellular receptors and enzymes
- Mobilizes copper from damaged tissue for redistribution
- Buffers copper to prevent free copper toxicity
GHK-Cu has been shown to modulate expression of a large number of genes involved in tissue remodeling:
| Gene Category | Examples | Effect |
|---|
| Extracellular matrix | Collagen I, III, IV, VII | ↑ Synthesis |
| Matrix metalloproteinases | MMP-1, MMP-2 | ↑ Remodeling |
| Tissue inhibitors | TIMP-1, TIMP-2 | ↑ Regulation |
| Growth factors | VEGF, FGF | ↑ Angiogenesis |
| Anti-inflammatory | IL-10 | ↑ Resolution |
| Pro-inflammatory | TNF-α, IL-6 | ↓ Expression |
GHK-Cu delivers copper to essential copper-dependent enzymes:
| Enzyme | Function | Relevance |
|---|
| Lysyl oxidase | Collagen cross-linking | Wound strength |
| Superoxide dismutase (Cu/Zn-SOD) | Antioxidant defense | Oxidative stress |
| Cytochrome c oxidase | Mitochondrial respiration | Cellular energy |
| Tyrosinase | Melanin synthesis | Pigmentation |
| Amine oxidase | Histamine degradation | Anti-inflammatory |
| Study Type | Model | Findings |
|---|
| In vitro | Human fibroblasts | ↑ Proliferation, ↑ collagen synthesis |
| In vivo | Rat wound model | Accelerated closure, ↑ tensile strength |
| Clinical | Chronic venous ulcers | Faster healing vs. standard care |
| Clinical | Burn wounds | Reduced scarring, improved healing time |
GHK-Cu accelerates all phases of wound healing:
- Inflammatory phase: Reduced excessive inflammation
- Proliferative phase: Enhanced fibroblast and keratinocyte activity
- Remodeling phase: Improved collagen organization
| Effect | Mechanism | Evidence Level |
|---|
| ↑ Collagen synthesis | TGF-β stimulation | In vitro + clinical |
| ↑ Glycosaminoglycan production | ECM remodeling | In vitro |
| ↑ Skin thickness | Dermal remodeling | Clinical observation |
| ↓ Fine lines | Collagen replenishment | Small clinical studies |
| ↑ Skin elasticity | Elastin and collagen | Clinical studies |
| Antioxidant | Cu/Zn-SOD activation | In vitro |
GHK-Cu demonstrates broad-spectrum antimicrobial properties:
| Microorganism | Activity |
|---|
| Staphylococcus aureus | Bacteriostatic |
| Pseudomonas aeruginosa | Bacteriostatic |
| Candida albicans | Antifungal |
| Escherichia coli | Bacteriostatic |
The antimicrobial mechanism involves copper-mediated disruption of microbial membranes and interference with microbial copper metabolism.
| Effect | Mechanism |
|---|
| ↑ Hair follicle size | Dermal papilla cell stimulation |
| ↑ Hair growth | 延长 anagen phase |
| Scalp health | Antimicrobial + anti-inflammatory |
GHK-Cu is used in some cosmetic formulations targeting hair loss.
- Wound care: Some wound dressings incorporate GHK-Cu
- Dermatology: Anti-aging skincare formulations (cosmeceutical)
- Hair loss: Topical scalp treatments
| Area | Status |
|---|
| Chronic wound healing | Clinical evidence |
| Anti-aging dermatology | Clinical evidence |
| Hair restoration | Preliminary clinical |
| Oral health | Preclinical |
| Neuroprotection | Preclinical |
| Parameter | Finding |
|---|
| Acute toxicity | Very low (LD50 >500 mg/kg in mice) |
| Skin irritation | Minimal at typical concentrations |
| Sensitization | Rare reports |
| Systemic toxicity | Low risk at topical doses |
| Application | Typical Concentration | Formulation |
|---|
| Anti-aging serum | 0.01–1.0% | Topical serum/cream |
| Wound healing | 0.01–0.1% | Gel, dressing |
| Hair treatment | 0.1–1.0% | Topical solution |
Note: Higher concentrations do not necessarily produce better results; copper homeostasis is concentration-dependent.
- Most anti-aging evidence is from small studies or in vitro work
- Optimal concentration remains debated
- Long-term clinical trial data is limited for cosmetic applications
- Copper metabolism is complex; individual responses may vary
- Pickart L, Margolina A. “Regenerative Medicine and Tissue Repair: GHK-Cu.” Curr Aging Sci 2018;11:87-95.
- Pickart L, Margolina A. “GHK Peptide: A Natural Copper Complex for Skin and Hair Care.” Cosmetics 2020;7:52.
- Pickart L, et al. “GHK-Cu: A Novel Peptide with Multiple Therapeutic Applications.” Antioxidants 2021;10:1030.
