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The Institute of Medicine has not established a tolerable upper intake level of B12 because studies show no adverse health effects when taking excess levels of B12, either through food or supplements
Whether caused by
Neurological issues A lack of vitamin B12 in your body could result in neurological issues
3 European Journal of EndocrinologyRaun et al
[2] [1] With neurological involvement: Hydroxocobalamin 1mg intramuscularly on alternate days until no further improvement, then maintenance injections every 2 months
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