ZQ II GHK Cu Copper Peptide Serum Manufacturer Anti Aging & Skin Repair EllieMD Glutathione Injection 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 L Glutathione Glutathione Supplement Glutathione Reduced
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