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A member asked:
How safe is b-12? i take 1000mcg extended a day? for fatigue. i also suffer severe health anxiety. and now am worried about blood clots
A doctor has provided 1 answer
Safe: There is no risk to taking vitamin B 12 by mouth. However, large doses of it are not beneficial if you are not deficient in the vitamin. The daily need is less than 5 micrograms/day.
Answered 2/17/2015
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