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The four components span distinct structural classes and non-overlapping pathway layers: BPC-157 for angiogenic and growth-factor signaling, GHK-Cu for copper-mediated extracellular-matrix and collagen biology, TB-500 (Thymosin Beta-4) for actin-driven cell migration, and KPV (the C-terminal -MSH fragment) for NF-B and inflammatory-cytokine modulation

There is no established safety data for the combination in any population, so the honest position is that contraindication data does not exist at the combination level

10.1074/jbc.REV120.011743 J

Vitamin C requires a low, acidic pH to penetrate the skin, which can destabilize the GHK-Cu peptide and reduce the effectiveness of both products