AHK-Cu

Overview

AHK-Cu (alanine-histidine-lysine copper tripeptide) is structurally related to GHK-Cu — both are copper-binding tripeptides in the same general research family — but AHK-Cu's primary published research focus is hair growth rather than the broader wound-healing and skin literature associated with GHK-Cu.

Proposed Mechanism of Action

Like other copper peptides, AHK-Cu's proposed activity relates to copper's role in enzymatic and growth-factor signaling. The cited study found that AHK-Cu at very low concentrations (picomolar to nanomolar range) stimulated elongation of human hair follicles and proliferation of dermal papilla cells — the cells at the base of the hair follicle central to regulating the hair growth cycle.

Research Context

The cited study is an ex vivo human hair follicle organ culture model — human hair follicles cultured directly, not an animal model or human clinical trial. AHK-Cu treatment increased follicle elongation and dermal papilla cell proliferation over the culture period.

Limitations of the Current Evidence

• The evidence base for AHK-Cu specifically is much thinner than for GHK-Cu — one ex vivo study is a meaningfully different (and lower) bar than the decades of accumulated GHK-Cu literature, despite the two compounds' structural similarity and frequent conflation in vendor/secondary sources.
• Ex vivo organ culture results, while more directly relevant to human tissue than a cell line or animal study, still don't establish what happens with topical or injectable application to intact human scalp in vivo.