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 GHK Cu (100mg) Research Peptide Kindred Aminos Longevity: Functional Medicine for Optimal Health and Wellness GHK Cu Copper Peptide Hair Tonic for Fuller Looking Hair 12 Week Supply (30 mL) 89030 95 5 GHK Cu Gly His Lys Cu Copper Tripeptide 1; Prezatide copper