Claimed effect · AHK-Cu

Does AHK-Cu help with hair follicle elongation?

D
Grade D — no human evidence1 laboratory study · effect size: not measurable
Short answerNo human evidence. As of 10 September 2026, only 1 laboratory study exists for AHK-Cu for hair follicle elongation. At nanomolar concentrations AHK-Cu lengthened cultured human follicles and increased dermal papilla cell proliferation; the anti-apoptotic effect it was designed to show was not statistically significant. Laboratory evidence, not clinical.

What the studies show

At nanomolar concentrations AHK-Cu lengthened cultured human follicles and increased dermal papilla cell proliferation; the anti-apoptotic effect it was designed to show was not statistically significant. Laboratory evidence, not clinical.

Animal studies, cell studies, or anecdotes only. This is where almost every viral peptide sits. Promising and proven are different words for a reason.

  1. 1
    Pyo HK, Yoo HG, Won CH, et al. The effect of tripeptide-copper complex on human hair growth in vitro.Arch Pharm Res, 2007Ex vivo follicles and cultured dermal papilla cells; no human subjects.

In context

AHK-Cu is a copper-bound tripeptide — alanine, histidine, lysine — marketed for hair growth in serums and, increasingly, as an injectable alongside GHK-Cu. The entire evidence base is one 2007 laboratory study in which it lengthened human hair follicles kept alive in culture and made dermal papilla cells divide. No trial has applied it to a person's scalp, let alone injected it. It is a legal cosmetic ingredient and nothing more; GHK-Cu, by contrast, has small human trials for topical skin use.

AHK-Cu is cosmetic ingredient; no clinical evidence. Legal status differs by country — see the regulation section or the jurisdiction pages.

Questions

Is AHK-Cu proven to help with hair follicle elongation?
No. There is no human evidence for it (1 laboratory study); the claim rests on animal or cell studies and LYO grades it D.
What studies are behind the grade?
At nanomolar concentrations AHK-Cu lengthened cultured human follicles and increased dermal papilla cell proliferation; the anti-apoptotic effect it was designed to show was not statistically significant. Laboratory evidence, not clinical.
Is AHK-Cu approved for this?
No. AHK-Cu is cosmetic ingredient; no clinical evidence; it is not an approved medicine for any indication in the jurisdictions LYO covers.

Other outcomes for AHK-Cu

Written and maintained by LYO Research — how pages are written and checked. Reviewed 10 September 2026. Grades count human evidence only; see how LYO grades. Not medical advice. Correct this page →