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Signs of an allergic reaction can include itchiness, a rash, hives, chest tightness, shortness of breath and swelling of the throat, lips, mouth or tongue
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It does this primarily by regulating nitric oxide, a molecule that controls how blood vessels expand and contract (Seiwerth et al., 2018)
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Yes, though rarely
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[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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Two details matter here
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