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Arch Biochem Biophys 595:6163 Kannan R, Chakrabarti R, Tang D, Kim KJ, Kaplowitz N (2000) GSH transport in human cerebrovascular endothelial cells and human astrocytes: evidence for luminal localization of Na+-dependent GSH transport in HCEC

PMID: 11713213

Folic acid has also been shown to decrease vitamin B12 levels as well

42, D1154D1158, doi: 10.1093/nar/gkt1157 (2014)