B12 is water-soluble your body excretes what it doesnt use
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Recommended Vitamin B12 Dosage for Nerve Pain The appropriate dosage of vitamin B12 for treating nerve pain depends on the severity of deficiency, the underlying cause, and individual patient factors
Moderate deficiency may include obvious macrocytic anemia, glossitis, as well as some mild or subtle neurological features, such as distal sensory impairment.[] Severe deficiency is characterized by bone marrow suppression, neurological features, and the risk of cardiomyopathy
For instance, a case study reported a woman developing chronic urticarial plaques after starting intramuscular Vitamin B12 injections, which resolved upon discontinuation of the injections