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Sequence : Gly-His-LysCuxHAc Molecular Formula : C14H23CuN6O4 Molecular Weight : 401.91 g/mol PubChem CID : 73587 CAS Number : 89030-95-5 Source: PubChem GHK-Cu is studied in laboratory systems as a model compound for investigating copper-related signaling, gene-expression patterns, oxidative-stress pathways, and extracellular matrix biology

doi:10.1007/s13277-012-0501-5

So you need a constant supply of antioxidants to switch off free radical damage

Strengthened Skin Barrier: The reparative properties of GHK-cu help to restore and protect the skin's natural barrier, increasing its resilience against environmental stressors and improving overall skin health