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B12 is generally safe, but certain medicationssuch as metformin, proton pump inhibitors, or some antibioticscan impact B12 absorption or effectiveness
However, do not stop prescribed B12 treatment without medical advice, particularly if you have documented deficiency or pernicious anaemia
If you have concerns about your immune system, consult your healthcare provider for personalized advice
NICE guidance acknowledges that response to treatment varies between individuals
Ultimately, the decision to start B12 injections should be made in consultation with one of our healthcare professionals
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