are b12 injections prescription only Cyanocobalamin Injection: Vitamin Deficiency Relief B12 Shots and NAD+ |

Diarrhoea (defined as three or more loose or watery stools per day) is an uncommon side effect of vitamin B12 supplementation , though it is listed as a rare or uncommon adverse reaction in the official product information for both oral cyanocobalamin and injectable hydroxocobalamin preparations

References [edit] "Inorganic Cyanide as Protecting Group in the Stereospecific Reconstitution of Vitamin B 12 from an Artificial Green Secocorrinoid" (PDF)

In vitro studies confirm minimal cytotoxicity with no impact on cell viability up to 100 M concentrations across multiple cell types, though higher concentrations may produce non-specific effects that could confound experimental results

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