GHK Cu 50mg Particle Peptides Close Blue Copper Peptides Powder Liquid Stock Photo 2682558735 Shutterstock GHK Cu Peptide 100mg For Copper Binding Research GHK Cu (10 mg, 50 mg, 100 mg) COA verified peptide Nootropix A GHK Cu face serum appears blue because the active ingredient, GHK Cu (copper peptide), is naturally a blue colored powder, meaning its inherent color transfers to the serum when mixed in; this blue hue