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2) Oral (Non-Liposomal) Standard oral capsules or drops are marketed for convenience, but peptides are prone to enzymatic breakdown in the GI tract

doi: 10.3390/nu12113443 490 KalilACThomasPG

Human glutathione S-transferase P1-1 interacts with TRAF2 and regulates TRAF2-ASK1 signals

Basic Clin Pharmacol Toxicol 126:8691

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GHK-Cu is a naturally occurring tripeptide composed of the amino acids glycine, histidine, and lysine (Gly-His-Lys), bound to a single copper(II) ion