AHK Cu hair serum (DIY) : r Hairtransplant R 10% Ghk Cu + 5% Ahk Cu Copper Peptide Hair Density Serum A few years ago, barely anyone was talking about copper peptides now GHK Cu and AHK Cu are everywhere in skincare, biohacking, and longevity conversations. But did you know there are copper peptides Amazon.com: Copper Peptide Hair Serum with Copper Tripeptide 1 Dual Peptide Scalp Treatment plus Licorice Root Extract : Beauty & Personal Care