copper palmitoyl heptapeptide 14 vs ghk cu Not all peptides are equal. Here's why ours is different. We compared our GHK-Cu Serum to The Ordinary's version so you don't have to. Ours: 1.2% concentration. Delivery system at ingredient Copper Peptide Face Tonic with GHK 89030-95-5 GHK-Cu Gly-His-Lys-Cu Copper Tripeptide-1;
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