Skin Perfection GHK Cu Copper Peptide Serum Booster, 1 Percent Blue Liquid For Face, Neck, Body, Hair, And Scalp, 0.5 oz Walmart.com 1% GHK CU solution: is this applied directly on skin or diluted further? : r DIYaesthetics 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 GHK Cu (Copper Peptide): The Blue & Gold Secret #ghkcu #peptides YouTube