Close Blue Copper Peptides Ghk cu Powder Stock Photo 2682985977 Shutterstock Glutathione IV Therapy: What You Need to Know Copper Peptide Serum for Dull & Mature Skin VALNCIA GHK Cu Copper Peptide Cosmetic Grade Copper Tripeptide 1 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