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 Professional Private Label Ghk Cu Copper Peptide Serum for Hair 10% 5% Ahk Cu Serum Hair Growth Treatment Strong Hair Roots Alibaba.com GHK CU 50mg Peptify Private Label Ghk Cu Serum Copper Peptide Hair Growth Copper Peptide Serum for Hair Growth Peptide