How to Apply and Use GHK Cu and AHK Cu Hair Serum for Hair Regrowth Peptide Labz GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? Copper Peptide Hair Growth Serum 10% GHK Cu & 5% AHK Cu Hairgenetix Ahk Cu Vs Ghk Cu Comparison Hair Growth Skin Benefits Copper peptides (GHK Cu) have been studied for decades for their role in tissue repair and that same biology applies to hair. Research shows GHK Cu may help strengthen existing hair follicles, reduce