Skin Perfection GHK Cu Copper Peptide Serum Booster, 1 Percent Blue Liquid For Face, Neck, Body, Hair, And Scalp, 0.5 oz Walmart.com Copper Peptide Serum with 1% GHK Cu peptide, Argireline and Matrixyl 3000 Am+Pm 5% B5+GHK Cu Hydrating Serum 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