Epidemiology

The Framingham Offspring Study found up to 39% of US adults at risk for vitamin B12 deficiency (defined as serum vitamin B12 <258 picomols/L [<350 picograms/mL]).[3] Prevalence increases with advancing age, and ranges from 5% to 15% in older people depending on the population studied and the methods of diagnosis.[4][5][6][7]

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