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Substantial amounts of the compounds and their metabolites are degraded in the colon by intestinal microbiota, giving rise to small phenolic acids and aromatic catabolises which are absorbed by the circulatory system ( Table 1 ) ( via SIRT1 activation are reported in Figure 1

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Neuroprotective effects of SIRT1 SIRT1 exerts a neuroprotective effect through the regulation of the expression of transcription factors including forkhead box O3 (FOXO3A), p53, E2F transcription factor 1 (E2F1), and C-terminal binding protein (CtBP) (Lu and Wang 2017)

They're forming in the deeper layers, working their way toward the surface over weeks or months