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For individuals with pernicious anaemia or a condition that prevents B12 absorption, injections are medically necessary because oral supplementation will not be absorbed effectively
There is no universal answer because there is no universal concentration
Double check your unit count, then withdraw the needle from the vial
The honest answer is somewhere in between, and worth understanding clearly before assuming its either essential or irrelevant
But you should always inform your healthcare provider about all medications and supplements youre using
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