AHK-Cu for hair: promising lab signal, unproven clinical benefit

AHK-Cu is a copper-binding tripeptide marketed in cosmetic and hair products. It is distinct from GHK-Cu, another copper peptide commonly discussed for skin. The most direct study we found for AHK-Cu concerns human hair follicles kept outside the body and cultured dermal papilla cells, not a trial in people losing hair. [1]

How might it work?

Dermal papilla cells help regulate a hair follicle's growth cycle. In a 2007 experiment, AHK-Cu stimulated cultured papilla-cell proliferation and elongation of isolated human hair follicles at laboratory concentrations from 10⁻¹² to 10⁻⁹ molar. Some cell-survival markers changed, but one measured reduction in dying cells was not statistically significant. These are mechanistic clues, not a demonstrated scalp treatment. [1]

What benefit has been shown?

The study supports further testing of AHK-Cu for hair growth. It does not tell us whether a topical product reaches a follicle at the tested concentration, whether it regrows hair in androgenetic alopecia, how it compares with established treatments, or how long any effect might last. We did not identify a controlled human scalp trial of the catalog AHK-Cu product. [1]

Safety and formulation

A topical cosmetic product and an injectable vial have different routes and quality requirements. The ex vivo study cannot establish the safety or efficacy of injecting AHK-Cu. A scalp product can also cause irritation, and its final concentration and other ingredients matter. [1,2]