AHK-Cu
PreclinicalA copper peptide riding on its famous cousin's reputation to back hair-growth claims it cannot fully support.
What it is
AHK-Cu is a copper-tripeptide: the amino acids alanine, histidine, and lysine wrapped around a copper ion. It comes from the same research family as the better-known copper peptide GHK-Cu, sharing the histidine 'grab handle' that lets the molecule hold onto its copper. It is a cosmetic ingredient found in many topical hair products.
How it works
Copper peptides nudge cells to communicate for repair and growth. In a dish, AHK-Cu stimulates the dermal papilla cells at the base of hair follicles, cells that direct follicle activity, and supports growth-factor signaling that can encourage hair development at the follicle level.
What people report
- ✦Stimulates hair-follicle cells in lab studies
- ✦Small cosmetic studies report modest gains in hair density and shaft thickness when applied topically
- ✦Its copper scaffold also has documented effects on bone-forming cells, suggesting real biology beyond hair
- ✦Topical, so the floor for harm is low
Typical use
Used topically, often daily as part of a hair-care routine, typically stacked with other treatments. There is no systemic protocol.
Dosing reference
No approved dose. It appears in cosmetics at typical product concentrations, and effect sizes in studies are nowhere near minoxidil or finasteride. There is no legitimate protocol for injecting it. Verify any product against that.
Reference only — not a recommendation. Verify via primary sources.
Watch for
The chemistry and lab effects are real, but the human clinical evidence for AHK-Cu specifically is small, mostly single-group, and dwarfed by the marketing. As an add-on with minoxidil it is plausible; as a standalone alopecia treatment it is not.
Notes
Real compound, real biology, overreaching claims. The 'copper peptide' halo is earned by GHK-Cu, and AHK-Cu inherits it without its own receipts.
Educational content — not medical advice.