GHK Cu Blue Copper Peptide + Betaine Serum Wonderlini exquisite skincare Blue Copper Ghk cu Peptide Manufacturers Suppliers Factory Salispharm Copper Peptides GHK Cu Beef Tallow for Skin: Blue Balm with Methylene Blue, Manuka Honey & Vitamin E Natural Face and Body Moisturizer for Mature, Dry & Sensitive Skin 2oz 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