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Greg Laughlin of the University of California, Santa Cruz, is co-author of the study

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Many health authorities recommend that adults over 50 years take a daily vitamin B12 supplement, usually in the range of 25100 micrograms per day, and/or consume foods fortified with vitamin B12

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The European recommended daily intake also varies by age, beginning at 1.5 g for infants and increasing to 4 g for adults, with slightly higher requirements during pregnancy and lactation (4.5 g and 5 g, respectively