Amazon.com: BLUPROTIN Copper Peptides Serum for Face, GHK CU Peptide with Propylene Glycol&Copper Tripeptide 1&Hyaluronic acid, Anti Aging Anti Wrinkle Moisturizing Restore Collagen Enhance Skin Elasticity 30ml : Beauty & Personal Care Copper Peptide Serum with 1% GHK Cu peptide, Argireline and Matrixyl 3000 GHK Cu Research Guide: Copper Peptide Overview and Laboratory Research 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
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