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Blood tests help confirm deficiency, monitor the effectiveness of injections, and prevent unnecessary overuse
Symptoms of a severe allergic reaction include difficulty breathing, swelling of the face or throat, rapid heartbeat, hives, and a sudden drop in blood pressure
Peripheral vascular thrombosis has also occurred
Serious systemic reactions: rare but possible Reports exist of anaphylaxis and severe allergic responses after vitamin B12 injections
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Food intolerances, particularly to lactose or fructose, may become more apparent during dietary transitions
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