AHK-Cu

AHK-Cu is a copper-binding tripeptide composed of alanine, histidine, and lysine, complexed with copper ions. It belongs to the same family of copper peptides as the much more famous GHK-Cu, but with different amino acid composition and a research profile specifically focused on hair follicle biology. It is studied as a topical and research-injectable peptide for hair growth, scalp health, and follicle regeneration. It is sold strictly for laboratory and cosmetic research use.

If GHK-Cu is the all-rounder copper peptide that does a bit of everything — skin, wound healing, hair — then AHK-Cu is the specialist. Researchers and cosmetic formulators focus on it almost entirely for hair: stimulating dermal papilla cells (the engine cells inside each follicle), extending the growth phase, and supporting larger, thicker hairs. Online, it shows up most often in DIY hair-loss protocols alongside minoxidil and other research peptides.

AHK-Cu binds copper ions tightly and delivers them to dermal papilla cells at the base of hair follicles. Copper is a required cofactor for lysyl oxidase and other enzymes essential for collagen and elastin maturation in follicle architecture. In vitro studies show AHK-Cu increases dermal papilla cell proliferation and vascular endothelial growth factor (VEGF) expression, which improves blood supply to follicles and extends the anagen (growth) phase of the hair cycle.

• •Dermal papilla cell proliferation
• •Anagen phase extension
• •VEGF expression in scalp tissue
• •Hair follicle miniaturization reversal models
• •Topical cosmetic delivery systems

AHK-Cu lives almost entirely on hair-loss forums — r/Tressless, HairLossTalk, and dermatology adjacents. Most posts compare it to GHK-Cu for hair-specific use, and many DIY users combine both in homemade scalp serums. It is generally regarded as the more focused choice when the goal is hair, with GHK-Cu still preferred for general skin and scalp health.

“GHK-Cu's hair-specialist sibling.”

The most common combination is AHK-Cu + GHK-Cu in topical scalp serums, often paired with minoxidil for additive vasodilatory effects. Some users add PTD-DBM or other Wnt-pathway compounds. None of these are validated clinical protocols.

AHK-Cu is a copper-binding tripeptide studied specifically for hair follicle stimulation, VEGF expression, and anagen-phase extension. It is the hair-focused counterpart to GHK-Cu and is sold for laboratory and cosmetic research use only.