AHK-Cu is copper tripeptide (alanine-histidine-lysine-copper), cosmetic ingredient. AHK-Cu is a small copper-binding peptide, a cousin of the better-known GHK-Cu. It appears in hair and skin-care products marketed for thicker-looking hair.
Education only. Not medical advice. No dosing information.
Status (verified Oct 29, 2026): Not an FDA-approved drug; lab (in-vitro) research only. Source: Lab study on human hair follicles published (Arch Pharm Res)
Evidence tier: Lab studies only
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What it is
AHK-Cu is a small copper-binding peptide, a cousin of the better-known GHK-Cu. It appears in hair and skin-care products marketed for thicker-looking hair.
How it works
In lab studies on human hair follicles, AHK-Cu encouraged follicle growth and supported the cells at the base of the hair (dermal papilla cells).
What it's researched for
Hair growth and hair thinning, so far only in lab studies.
Where it shows up on Peptide Horizon
Regulatory and research timeline
- 2007-07: Lab study on human hair follicles published (Arch Pharm Res) (source)
Key trials and studies
FAQ
Is AHK-Cu FDA approved?
No. It is not an FDA-approved drug for hair loss or any other condition.
Does AHK-Cu regrow hair?
Evidence so far comes from lab studies on hair follicles, not controlled human trials.
AHK-Cu vs GHK-Cu?
Both are copper tripeptides; GHK-Cu has more published research, mainly on skin.
Related peptides
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Sources
Editorial review - Last reviewed Oct 29, 2026