AHK-Cu
Also known as: copper tripeptide-3, AHK copper
By GLPeptideSciences Editorial Team · How we evaluate evidence · Reviewed by Dr. George S. Watson, MD, Cardiothoracic Surgeon · Updated 2026-06-02
A copper-binding cosmetic tripeptide, related to GHK-Cu but marketed primarily around hair appearance and follicle support.
What it is & how it works
What it is
AHK-Cu is a copper-binding cosmetic tripeptide, a cousin of GHK-Cu, marketed mainly around hair appearance and follicle support.
How it is thought to work
Copper peptides are associated with signaling involved in tissue and follicle support; AHK-Cu is formulated topically toward hair-related cosmetic outcomes.
The evidence and the caveat
Like most cosmetic peptides, the evidence is cosmetic-grade and manufacturer-driven, and the effects are modest and appearance-level rather than clinical.
What it's discussed & studied for
- Hair appearance and follicle support (topical cosmetic)
- Skin discussion
Discussion of a use is not a claim that it works or is approved.
Research status
A cosmetic-ingredient copper peptide. Evidence is largely cosmetic-grade and manufacturer-driven rather than rigorous clinical trials.
Evidence quality
Cosmetic-tier. Effects, where present, are modest and appearance-level.
Dosing discussion
Used as a topical ingredient in formulations; not injected.
Educational summary of what is discussed in the literature and community — not a dosing recommendation or medical advice.
Safety & harm reduction
Generally well tolerated topically. As with all copper peptides, formulation and concentration matter.
Sourcing literacy
Sold as a cosmetic raw ingredient; quality varies by supplier.
Selected literature
FAQ
How is AHK-Cu different from GHK-Cu?
Both are copper-binding cosmetic peptides; AHK-Cu is marketed more around hair and follicle support, while GHK-Cu is discussed more for skin.