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How much and how often you need it depends on you

J Cancer Res Clin Oncol 135:12231229

doi: 10.1038/s41598-018-26882-8 6 CuiYYangDWangWZhangLLiuHMaSet al
Because 10 to 30 percent of older people may be unable to effectively absorb vitamin B 12 naturally occurring in foods, those older than 50 years should meet their RDA mainly by consuming foods fortified with vitamin B 12 or a supplement containing vitamin B 12

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Histology and histopathology , 17 (3), 707714