Define the toxicity of vitamin b12, Biology

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Define the Toxicity of Vitamin B12?

Intake of 1000 μg vitamin B12 has never been reported to have any side-effects.  Similar large amounts have been used in some preparations of nutritional supplements without apparent ill effects. However, there are no established benefits for such amounts. Such high intakes thus represent no benefit in those without malabsorption and should probably be avoided.


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