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You can get more vitamin B12 by eating certain animal products and fortified foods
When absorption is impaired due to a diagnosed condition such as pernicious anaemia, injections are generally the preferred and more effective option
So when a medic says that someone with PA "can use the stored B12 in their liver", as far as I know, we simply don't know whether this is true or not
However, route selection, administration hierarchies, documentation requirements, HCPCS drug reporting, and payer rules can quickly complicate the process
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