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 Dosage and Protocol: A Medical Provider's Guide to the 30 Day Cycle Perfect B Buy GHK CU (Copper) (50mg) Biotech Peptides PSA] Albeit rare Copper peptide "uglies" are real and scary. Case report and looking for advices : r SkincareAddiction
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zinc ghk cu Thoughts on the colour of this GHK-CU 50mg (still in powder form) : r/PeptidePathways