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Status of vitamins B-12 and B-6 but not of folate, homocysteine, and the methylenetetrahydrofolate reductase C677T polymorphism are associated with impaired cognition and depression in adults.
Moorthy D, Peter I, Scott TM, Parnell LD, Lai CQ, Crott JW, Ordovás JM, Selhub J, Griffith J, Rosenberg IH, Tucker KL, Troen AM. Moorthy D, et al. J Nutr. 2012 Aug;142(8):1554-60. doi: 10.3945/jn.112.161828. Epub 2012 Jun 27. J Nutr. 2012. PMID: 22739363 Free PMC article.