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  1. Originally Answered: Is there tolerance to Vitamin B?
    There is no Vitamin B. There are several vitamins that, for archaic reasons, are collectively termed B vitamins.

    They are essential nutrients. That means our bodies require them but cannot synthesize them.

    All the B vitamins are water soluble, which means any but the most extreme intake does not produe a toxic effect, the excess is readily excreted in your urine.

    One B vitamen, B 12 (cobalamin) is associated with a very nasty kind of deficiency disease called pernicious anemia. It is debilitating and irreversible if not treated promptly. It has negative neurological effects. It also turns out that there are no plant sources of cobalamin. Thus pure vegetarian / vegan diets who do not consume B 12 supplements put their practitioners at risk for this disorder.

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