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Description
Others alternate between them, using each for periods before switching
These include: Allergic reactions, such as hives or trouble breathing Heart problems in people with heart issues Drug Interactions and Contraindications Vitamin B12 shots can affect how some medicines work or have special warnings
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This position is supported by the NICE Guideline and at the end of 2025 we launched our freely accessible Pernicious Anaemia and B12 Deficiency education programme to the NHS community
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