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Levels did not significantly differ between those mothers who, according to a dietary questionnaire, took vitamin supplements containing B 12 compared to those who did not, although the B 12 supplemental dose was only 3 mcg per day.[45] Four hundred ninety-one pregnancy women in Dar-es-Salaam, Tanzania were randomized to receive a daily multivitamin supplement containing 50 mcg vitamin B 12 or placebo from 20 weeks gestation

Adults generally require around 1.5 micrograms per day and pregnant or breastfeeding women require up to 2.8 micrograms a day

For cognitive support, most are better off opting for legal, better-studied supplements