GHK
Research OnlyAlso known as: Glycyl-Histidyl-Lysine, GHK tripeptide, Liver cell growth factor
A naturally occurring tripeptide (Gly-His-Lys) with copper-binding affinity and wound healing properties. The base form of GHK without added copper. Endogenous to human plasma where it circulates bound to copper. Declines with age. Most research focuses on the copper-complexed form (GHK-Cu), making evidence for GHK alone limited. Primarily relevant as the precursor to GHK-Cu.
Research Statistics
GHK tripeptide with less data than GHK-Cu; proposed copper-independent signaling mechanism.
Research Dossier
Overview
What is GHK and what does the research say?
Mechanism of Action
The proposed mechanisms of GHK are based primarily on studies of its copper complex (GHK-Cu). Human mechanistic data for GHK alone is very limited.
How It Works (Simplified)
GHK is a natural “signal molecule” released from damaged tissue. Its primary function is to bind copper and deliver it to repair processes:
Binds copper with extremely high affinity (Kd ~10^-16 M), delivering it to copper-dependent enzymes essential for tissue repair.
Up- and downregulates 4,000+ genes involved in DNA repair, antioxidant defense, and tissue remodeling pathways.
Stimulates fibroblasts to produce collagen, elastin, and glycosaminoglycans for extracellular matrix repair.
Inhibits iron release from ferritin in damaged tissues, reducing lipid peroxidation and oxidative damage.
Scientific Pathways
Copper-Dependent Enzyme Activation (Primary Mechanism)
GHK + Cu2+ → GHK-Cu complex → Copper delivery to:
↓
Lysyl oxidase (collagen crosslinking)
SOD-1 (antioxidant defense)
Cytochrome c oxidase (cellular respiration)Gene Expression Modulation (Broad Effects)
GHK → Cellular uptake → Modulation of 4,000+ genes:
↓
DNA repair genes (47 UP, 5 DOWN)
Antioxidant genes (upregulated)
Tissue remodeling (collagen, MMPs, TIMPs)Key Research: Pickart L, Margolina A (2018) comprehensive review of gene expression effects. PMID:29986520
Important Limitations
- GHK alone has minimal biological activity without copper
- Nearly all functional studies use GHK-Cu (the copper complex)
- The natural form in the body is GHK bound to copper
- Translation of GHK effects independent of copper is unconfirmed
- For practical applications, GHK-Cu is the relevant form
Evidence-Chained Benefits
Evidence-Chained Benefits
Research findings linked to mechanisms and clinical outcomes
What to Expect
Timeline based on observations from published studies. Individual responses may vary.
GHK rapidly binds copper with extremely high affinity (Kd ~10^-16 M). In vivo, GHK circulates bound to copper and is released from extracellular matrix during tissue injury.
GHK-Cu cream applied for 12 weeks showed improvements in skin density and fine lines. Wound healing effects in animal models observed over days to weeks of treatment.
Long-term effects of GHK (without copper) supplementation are not characterized. Endogenous GHK levels decline with age (200 ng/mL at age 20 to 80 ng/mL at age 60). Implications of supplementing GHK alone are unknown.
Research-Based Observations
This timeline reflects observations from published clinical and preclinical studies. Individual responses may vary significantly. This is not a guarantee of effects or a dosing schedule. Consult qualified healthcare providers for personalized guidance.
Quality Checklist
Visual indicators to help evaluate GHK product quality
Good Signs (5 indicators)
Warning Signs (4 indicators)
Bad Signs (5 indicators)
For Research Evaluation Only
These quality indicators are general guidelines based on typical peptide characteristics. Professional laboratory testing (HPLC, mass spectrometry) provides definitive quality verification. This checklist is for initial visual evaluation only.
Peptide Interactions
Known and theoretical interactions when combining GHK with other peptides. Based on published research and mechanistic considerations.
BPC-157
CompatibleDifferent regenerative mechanisms - GHK for copper delivery and collagen synthesis, BPC-157 for angiogenesis and tissue healing.
TB-500
CompatibleDifferent tissue repair targets - GHK affects gene expression and copper enzymes, TB-500 regulates actin for cell migration.
LL-37
CompatibleGHK's wound healing effects may complement LL-37's antimicrobial properties in wound care applications.
Epithalon
CompatibleDifferent anti-aging mechanisms - GHK for gene expression modulation and tissue repair, epithalon for telomerase activation.
GHK-Cu
AvoidGHK is the base peptide that complexes with copper to form GHK-Cu. Using both is redundant - GHK-Cu is the biologically active form.
Research Note: Interaction data is based on published literature, mechanistic understanding, and theoretical considerations. Most peptide combinations lack direct clinical study. This information is for educational purposes only and does not constitute medical advice. Always consult qualified healthcare providers.
References
Key Studies Cited
Full reference list available on request. All citations link to PubMed for verification.
Methodology Note
This dossier synthesizes available evidence from peer-reviewed literature, regulatory documents, and clinical trial registries. Evidence strength ratings follow a modified GRADE approach.
For complete methodology details, see our Methodology page.
Important Disclaimer
This dossier is for educational purposes only and does not constitute medical advice. Always consult a qualified healthcare provider before making health decisions.
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