best time to take vitamin b12 injections How Long Does It Work? Vitamin B12 shots: Uses, benefits,

This amount helps keep B12 levels up, vital for nerves

These examples follow the same biological pattern seen across routine vaccinations where temporary pain fits within predictable boundaries shaped by blood flow, swelling and immune activity

For individuals requiring supplementation due to confirmed deficiency or malabsorption, therapeutic doses vary considerably depending on the underlying cause: Dietary deficiency : 50150 micrograms daily orally, or cyanocobalamin tablets as prescribed Pernicious anaemia : Initially hydroxocobalamin 1 mg intramuscularly three times weekly for two weeks, then maintenance injections every two to three months [3] Neurological involvement : More intensive regimens may be required, with hydroxocobalamin injections on alternate days until symptom improvement [3] NICE guidance emphasises that supplementation should be evidence-based rather than speculative

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They have no major side effects