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Fortunately, there is increasing evidence that oral B12 supplements are just as good as injections for raising blood levels in most people ( Vegetarians and vegans are usually advised to take at least 10 mcg per day, or at least 2,000 mcg once per week ( However, some doctors still prefer the use of injections
But people who avoid animal products can get an adequate supply through fortified breakfast cereals and nutritional yeast
For that group, treating the deficiency is important, because an untreated deficiency does not stay still
the 50 mg vial gives 20 doses at 2.5 mg
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