L Glutathione test report HealthyHey Skin Perfection GHK Cu Copper Peptide Serum Booster, 1 Percent Blue Liquid For Face, Neck, Body, Hair, And Scalp, 0.5 oz Walmart.com 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 Young Goose Blue Peptide Spray Blue Copper Peptide (GHK Cu) Guide: Anti Aging Science, Formulation & OEM
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