Neurogan Health, GHK Cu Copper Peptide, Hair & Scalp Serum ZS Factory Price 99% Ghk Cu Lyophilized Powder for Scalp Repair AHK CU + GHK Cu Hair Serum Pro 4800mg Hair Growth Neurogan Defy GHK Cu (glycyl L histidyl L lysine) is a naturally occurring copper binding peptide found in human plasma. As levels decline with age, so may its support of the biological processes involved in collagen production, skin