What Is the Recommended Dietary Allowance (RDA) of Vitamin B12?

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The dietary reference intakes from the institute of medicine which includes the RDAs when we know the RDA ought to be, specify different intake level based on sex and age and so a detailed answer really would require a whole table here, but the average level recommended for adults is two and a half micro grams a day and that's actually a small number but ere is the interesting thing about B12.

We store it in the liver and actually can build up a reserve that can last 30 years, so what we're doing with our daily intake is just maintaining that storage level B12. Two and a half micrograms a day is enough for a healthy adult.