GHK-Cu vs AHK-Cu
GHK-Cu and AHK-Cu are both copper-binding tripeptides, but they are studied for different tissue targets. GHK-Cu is the classic skin-remodeling copper peptide, while AHK-Cu research concentrates on hair follicle biology.
Side-by-Side Comparison
| Property | GHK-Cu | AHK-Cu |
|---|---|---|
| Category | Copper-binding tripeptide (glycyl-L-histidyl-L-lysine : Cu2+) | Copper-binding tripeptide (L-alanyl-L-histidyl-L-lysine : Cu2+) |
| Mechanism of Action | Delivers copper to cells; stimulates collagen and glycosaminoglycan synthesis, modulates metalloproteinases, promotes wound remodeling and angiogenesis | Delivers copper to cells; stimulates dermal papilla cell proliferation and VEGF expression, studied for prolonging the anagen (growth) phase of hair follicles |
| Molecular Weight | ~340 Da (peptide); ~403 Da as copper complex | ~327 Da (peptide); ~390 Da as copper complex |
| Origin | Naturally occurring in human plasma, saliva, and urine; plasma levels decline substantially with age | Synthetic analog designed around the His-Lys copper-binding motif |
| Primary Research Focus | Skin regeneration, wound healing, anti-aging and tissue remodeling gene expression | Hair growth, follicle miniaturization, dermal papilla cell biology |
| Key Research Citations | Pickart & Margolina (2018), Int J Mol Sci; Maquart et al. (1993), J Clin Invest | Pyo et al. (2007), Arch Pharm Res |
Key Differences
- GHK-Cu is a naturally occurring plasma peptide whose levels fall with age; AHK-Cu is a synthetic analog built on the same copper-binding chemistry.
- GHK-Cu research spans skin remodeling, wound healing, and broad gene-expression modulation; AHK-Cu research is narrowly focused on hair follicle and dermal papilla biology.
- GHK-Cu has a far larger literature, including work on collagen synthesis and metalloproteinase regulation; AHK-Cu’s published evidence base is comparatively small.
- Both function as copper-delivery vehicles, and both are studied primarily in topical or localized research models rather than systemic protocols.
Research Summary
GHK-Cu and AHK-Cu apply the same principle, using a small His-Lys-containing tripeptide to chelate and deliver copper, to different tissue questions. GHK-Cu is the extensively documented skin-remodeling peptide, with research covering collagen synthesis, wound healing, and age-related gene expression. AHK-Cu is a synthetic sibling studied almost exclusively in hair follicle models, where dermal papilla proliferation and VEGF expression are the primary endpoints. GHK-Cu carries the deeper literature; AHK-Cu the narrower, follicle-specific focus.
What is the difference between GHK-Cu and AHK-Cu?
Both are copper-binding tripeptides, but GHK-Cu (glycyl-histidyl-lysine) is a naturally occurring plasma peptide studied for skin remodeling, collagen synthesis, and wound healing, while AHK-Cu (alanyl-histidyl-lysine) is a synthetic analog studied mainly for hair follicle biology, including dermal papilla cell proliferation and VEGF expression. GHK-Cu has a much larger research literature.
More Comparisons
Disclaimer: All compounds referenced on this page are sold for research and laboratory use only. The comparisons presented are based on published scientific literature and are intended for educational and informational purposes. This content does not constitute medical advice. Researchers should consult primary literature and applicable regulations before designing study protocols.