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In summary, gut dysbiosis may contribute to neurodegeneration by shifting the immune system toward a pro-inflammatory state, breaching the gut barrier, and chronically activating microglia and astrocytes in the brain

As per custom, NOW included both in-house and independent testing on its own brand in the group of products being examined

Kim SM, Kim YB, Kuzuyama T, Kim SU (2008) Two copies of 4-(cytidine 5-diphospho)-2-C-methyl-d-erythritol kinase (CMK) gene in Ginkgo biloba: Molecular cloning and functional characterization

They can guide you to choose a suitable supplement based on your medical history and goals