Your copper peptide product should be this exact blue. If it isn't, you already have your answer. GHK Cu is blue because of coordination chemistry, not dye. The Cu ion at the center The GHK Cu Peptide: Benefits, Uses, and Why it's Known as the Regenerative Copper Complex GHK Cu 50mg Lyophilized Peptide PatriotChems Reduced Glutathione Supplement, 1000mg Pure Glutathione with Alpha Lipoic Acid & Milk Thistle for Skin, Liver & Immune Support, Nature's Craft, 120ct : Target