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If the cause isn't dietary then it is an absorption problem so you need to find another way of replenishing B12 initially
High-dose oral B12 is not routinely used for pernicious anaemia management in NHS practice
The only difference is that you cant see it
This means that it is not possible to overdose on vitamin B12, and as far as we know there is no upper limit on the amount of B12 that can be taken safely by an otherwise healthy person
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