adverse effects b12 injections What are the benefits of injection? B12 Side Effects: Too Much
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This is where Vitamin B12 comes in

For neurological involvement, hydroxocobalamin 1mg should be given on alternate days until no further improvement, before moving to maintenance

doi: 10.1001/archneurol.2010.227 116 DreherSIGrubbaPvon ToerneCMoruzziAMaurerJGojTet al

PLoS One 2015;10:e0129915 10.1371/journal.pone.0129915 [DOI] [PMC free article] [PubMed] [Google Scholar] 17

Your physician will assess through medical and dietary history
Also, why leave the patient perhaps 2 weeks without their treatment when they need it
