Copper Peptide Serum for Dull & Mature Skin VALNCIA ReMed HydraPen (GHK Cu) Blue Copper Peptide Serum (2x5 ml) FillerDepot HealthyDerm Copper Peptides GHK Cu Beef Tallow for Skin: Blue Balm with Methylene Blue, Manuka Honey One of my patients has shared this picture with me as she felt it was odd that this peptide had this very vivid blue colour, while her other peptides had a clear Cellular Glow Copper Peptide GHK Cu Serum for Face Skin Perfection GHK Cu Copper Peptide Serum Booster, 1 Percent Blue Liquid For Face, Neck, Body, Hair, And Scalp, 0.5 oz Walmart.com