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 Buy HOT SELL WHOLESALE PRICE 99% PURITY BLUE COPPER PEPTIDE GHK CU AHK CU 98% Blue powder LanShan Cosmetics Grade from Xi'an Lanshan Biotechnology Co., Ltd. ECHEMI GHK Cu Peptide (50mg) Advanced Skin Rejuvenation & Healing Support GHK CU 100mg 99%+ Purity, COA Verified Close Blue Copper Peptides Ghk cu Powder Stock Photo 2682985977 Shutterstock GHK Cu Peptide: What It Does for Body Composition and Metabolic Health