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We know from research that retinol works when applied to the skin, so it can work at the skin's naturally acidic pH

doi: 10.1002/fsn3.962 92

SCFAs, particularly butyrate, are known to support epithelial and BBB integrity and regulate microglial homeostasis, whereas altered microbial composition in PD may shift metabolite profiles toward a more pro-inflammatory state [123]

211,212 For example, age-related upregulation of CXCR4 leads to mislocalization of Tfh cells to the dark zone, along with a significant reduction in the follicular dendritic cell (FDC) network area and a marked decrease in the number of plasma cells