Peptides vs vitamin c TikTok Shop A GHK Cu face serum appears blue because the active ingredient, GHK Cu (copper peptide), is naturally a blue colored powder, meaning its inherent color transfers to the serum when mixed in; this blue hue PCL GHK CU 75mg PekCura Labs Copper Tripeptide (GHK Cu) for Advanced Skincare & Haircare Formulatio GHK CU, PTD DBM, Zinc Thymulin for Healthier Hair GHK CU + Zinc, 60 PurePeptides , 4696029892
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zinc ghk cu 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 Cu²⁺ ion at the center