[10] [11] Intramuscular B12 injections (hydroxocobalamin or cyanocobalamin) bypass the digestive system, but UK product information (SmPCs) for hydroxocobalamin injections does list gastrointestinal disturbances, including diarrhoea, as possible adverse reactions, albeit rare
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Contamination at this stage can introduce bacteria that the benzyl alcohol alone may not fully control, especially with repeated access over weeks
Since publishing my book, I've received countless emails from patients denied B12 shots and unable to find treatment elsewhere
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