Advanced GHK CU + AHK CU Peptide Hair Growth Serum 30ml Azur Skin Amazon.com: Skin Perfection Copper Peptide Serum GHK CU 1% for Face & Hair Copper Peptides for Skin, Hair, & Scalp 1% Blue Liquid for Face, Neck, Body, Scalp Multi Use Serum Booster with People are searching for the GHK Cu pen. Ordering it online. Trying to figure out how to use it safely at home. We looked at all of that and thought: there has to Neurogan Health, GHK Cu Copper Peptide, Hair & Scalp Serum