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A member asked:
Why are we precsribed 1000 mcg/day of b12 for deficiency? and why not higher dose, e.g. 2000/3000/5000 mcg?
3 doctors weighed in across 2 answers
More not better: Your body has a threshold at which adding more does not result in a better result, rather it is simply urinated out of the system. B12 is a water soluble vitamin. Adding more beyond the saturation point does not make things necessarily happen faster.
Answered 6/10/2018
3.6k views
Urinary Excretion: The bone marrow can only use a certain amount of B12 at a time to produce red cells. The remainder will be excreted in the urine. It would be useless to take more. Thanks for trusting HealthTap!
Answered 10/30/2014
3.6k views
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