The Science of skin & hair

Hair-growth products are full of ingredients promising thicker, stronger, faster-growing hair. Copper peptides have earned a particularly interesting place in that conversation—and AHK-Cu is one of the lesser-known compounds behind it.

AHK-Cu is a copper-binding peptide formed when the tripeptide AHK (alanine-histidine-lysine) complexes with copper.

If that sounds familiar, there’s a reason.

Its better-known relative, GHK-Cu, is another naturally occurring copper-binding tripeptide that has been studied extensively for its involvement in wound healing, extracellular-matrix remodeling and skin biology.

AHK-Cu, however, has attracted specific research interest for something else:

the human hair follicle.

GHK-Cu is one of the more established names in peptide research. Unlike many compounds that have only recently gained attention online, the science surrounding GHK-Cu stretches back decades.

It is particularly well known in cosmetic science, where copper peptides appear in products marketed for aging skin, skin texture, and hair care. But GHK-Cu has also been investigated in laboratory and preclinical research involving wound healing, inflammation, collagen production, tissue remodeling, and cellular signaling.

There is an important distinction, though: the evidence isn’t equally strong for all of those claims.

Topical skin research is considerably more developed than research supporting many of the systemic or injectable claims now associated with GHK-Cu.