GHK-Cu (Copper Peptide) vs PE-22-28
A detailed comparison to help you understand the differences and choose the right peptide for your research goals.
GHK-Cu (Copper Peptide)
GHK-Cu is a naturally occurring copper peptide found in human plasma, saliva, and urine. It plays important roles in wound healing, tissue repair, and has shown anti-aging properties in research.
Full details →PE-22-28
PE-22-28 is a synthetic peptide fragment derived from research on the SAMP8 mouse model of accelerated aging. It has shown potential for enhancing memory and reducing cognitive decline.
Full details →Side-by-Side Comparison
| Aspect | GHK-Cu (Copper Peptide) | PE-22-28 |
|---|---|---|
| Dose Range | 1 mg–2 mg | 500 mcg–2 mg |
| Frequency | 1x daily | 1x daily |
| Cycle Length | 4–8 weeks | 1–2 weeks |
| Route | subcutaneous | subcutaneous |
| Mechanism | Attracts immune cells and fibroblasts to wound sites, stimulates collagen and glycosaminoglycan synthesis, promotes angiogenesis, and has antioxidant effects. Modulates gene expression related to tissue repair. | Derived from the protein that is deficient in SAMP8 mice. May work by inhibiting protein phosphatase 2A methylesterase, thereby affecting memory-related signaling pathways. |
| Typical Dosage | Topical: Applied as serum or cream 1-2 times daily. Injectable: 1-2mg daily for research purposes. Microneedling protocols often use 0.5-1%. | Research protocols vary. Intranasal dosing has been studied at various concentrations. Optimal human dosing not established. |
| Administration | Most commonly used topically for skin applications. Can be injected subcutaneously for systemic effects. Often combined with microneedling for enhanced skin penetration. | Intranasal administration preferred for CNS delivery. Research compound with limited human use data. |
| Side Effects | Topical use is generally well-tolerated. May cause temporary skin irritation or redness in sensitive individuals. Injectable use may cause injection site reactions. | Very limited human data. Primarily studied in animal models for safety and efficacy. |
| Best For |
Key Differences
Unique to GHK-Cu (Copper Peptide):
Unique to PE-22-28:
Key Studies
GHK-Cu (Copper Peptide)
- Middle-aged mice treated with GHK-Cu peptide administered intraperitoneally or intranasally show behavioral rescue but divergent hippocampal aging programs.
Research square, 2026
- Glycyl-L-histidyl-L-lysine-Cu2(+) (GHK-Cu) Attenuates CuSO(4) or LPS induced-inflammation in Zebrafish larvae model.
European journal of pharmacology, 2026
- The Regenerative Potential of GHK-Cu in Aesthetic Medicine.
Aesthetic surgery journal, 2026
Ready to Learn More?
Looking for trusted sources?