is vitamin b12 injection better than tablets Injections: Good or Bad? Vitamin B-12 Injections Vs Oral

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While oral bioavailability is lower than subcutaneous administration, these studies established that even high oral doses maintained excellent safety profiles, though higher doses (54 mg) were associated with increased gastrointestinal discomfort

your body will use what it needs and harmlessly eliminate the rest

References Stier H

Of these seven groups, the Firmicutes , Proteobacteria , and Verrucomicrobia phyla demonstrated a significant main effect of treatment group on relative abundance after BenjaminiHochberg correction for multiple comparisons, while Bacteroidetes and Actinobacteria demonstrated significant main effects of treatment group on relative abundance before BenjaminiHochberg correction