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It is best to follow a healthcare professionals guidance on whether they recommend vitamin B12 supplements based on individual circumstances.
[1] Particular concerns with multi-dose vials include dosing errors (confusion between mg, mL, or units) and contamination from repeated access
metabolism, cellular methylation, mitochondrial physiology, energy regulation, and metabolic signaling
These include some anticonvulsants (medicines used to treat epilepsy), colestyramine, sulfasalazine and methotrexate
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