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We investigated the efficacy and safety of oral vitamin B12 replacement for gastric cancer patients with vitamin B12 deficiency after total gastrectomy

Russell GM, Henley DE, Leendertz J, Douthwaite JA, Wood SA, Stevens A, Woltersdorf WW, Peeters BW, Ruigt GS, White A, Veldhuis JD, Lightman SL

Auwerx J

Ashraf J
For more on safety and how these compounds affect the brain, see How Nootropics Work and Nootropic Side Effects

Rudolf et al., 2013