Cellular Glow Hair Serum 10% GHK Cu + 5% AHK Cu Peptides Copper Peptide Hair Growth Treatment Serum, GHK Cu and AHK Cu, Licorice Extract,1oz Haircare Comfort TikTok Shop What is GHK Cu? GHK Cu (glycyl L histidyl L lysine copper complex) is a naturally occurring peptide in human plasma that: Binds copper ions Acts as a biological signalling molecule Plays a role GHK Cu Copper Peptide 0.5% (topical foam)