Peptide library / Skin & aging / AHK-Cu
AHK-Cu
A copper-binding tripeptide marketed for hair growth and skin thickness.
Effects studied or claimed
What it is used or promoted for, and where each effect has actually been seen
- Hair growth, claimedLab
- Skin thicknessLab
How it is thought to work
AHK-Cu is reported to stimulate hair follicle cells and increase collagen in cell models.
What the evidence shows
Support comes mainly from cell and small manufacturer-sponsored studies. Independent clinical trials are lacking.
Safety and unknowns
Topical use can cause irritation. Injection is not recommended.
Regulatory status
Used as a cosmetic ingredient.
Regulatory status changes quickly. This entry was last reviewed on 27 October 2026. Confirm current status with the FDA before relying on it.
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General information, not medical advice. Do not buy or inject unregulated peptides.