The GHK Cu delays aging in Caenorhabditis elegans via coordinated regulation of mitochondrial function and activation of DAF 16 SKN 1 pathways Biogerontology Springer Nature Link 99% Pure Copper Peptides (ghk cu) Great for DIY 1 Gram Etsy Copper Tripeptide Ghk Cu AHUALYN GHK Cu (100mg) Research Peptide Kindred Aminos 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