Advanced GHK Cu Face Cream 2400mg 4% Firmer Skin Neurogan Neurogan Health 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 Skin Care: Anti Aging Benefits GHK Cu (100mg) 6ml Vial
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