is glutamic acid and glutathione the same think for Food Health Applications with Emphasis on Extraction, Identification, and Quantification Methods: A Review Amino acid metabolism in health

In diseases such as prion disorders, it has been shown that microglial activation may contribute to disease progression through the release of proinflammatory mediators [33,34]

Yes, you can take B12 supplements or a multivitamin that includes B12

Using Patch-seq, a negative correlation between the hepatocyte nuclear factor 1- (HNF1A) target gene FXYD2 (an inhibitory subunit of the Na + /K + -ATPase) and Na + influx was observed, suggesting a model whereby HNF1A facilitates membrane depolarisation and insulin secretion by upregulating sodium/potassium-transporting ATPase subunit (FXYD2)

Additionally, TBHQ is effective in preserving the color of iron-containing foods, preventing discoloration (Van Esch 1986)