GHK Cu Copper Peptide Hair & Scalp Serum YanaSecrets Has anyone tried aGHK CU serum for hair? It's a copper peptide based serum for hair. : r FemaleHairLoss 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 MOST EFFECTIVE Scalp Serum Hair Growth Factor 5% GHK CU Copper Peptide Rosemary