Antioxidant effect of polyphenols and natural phenols
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A polyphenol antioxidant is a hypothetized type of antioxidant, in which each instance would contain a polyphenolic substructure; such instances which have been studied in vitro. Numbering over 4,000 distinct chemical structures (mostly from plants), such polyphenols may [vague] have antioxidant activity {{{1}}} in vitro [vague] (although they are unlikely to be antioxidants in vivo).[1] [2][3] Hypothetically, they may affect cell-to-cell signaling, receptor sensitivity, inflammatory enzyme activity or gene regulation,[3][4] although high-quality clinical research has not confirmed any of these possible effects in humans as of 2020[update].[1]