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 GHK Cu Regenerative Toner Blue is the color of our Blue Copper Peptide Serum Complex of 3% , #ghk #copperpeptide #serum #skincare #valenciacosmetica Close Blue Copper Peptides Ghk cu Powder Stock Photo 2682985977 Shutterstock GHK Cu (Copper Peptide) AzulBotanicals Ward What make blue? . The blue color of GHK Cu is due to the copper ion mineral bound with the peptide. The binding occurs through the donation of electrons