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 BPC 157& TB 500 & GHK Cu Peptide Blend: Mechanistic Insights GHK Cu: The Elegant Copper Peptide for Skin and Scalp Renewal Renew Vitality Buy GHK Cu 50mg (Copper Peptide) Online 99% Purity GHK Cu 50mg Third Kind GHK Cu as a multifunctional copper peptide: synthesis routes, process engineering and emerging applications Systems Microbiology and Biomanufacturing Springer Nature Link