best size needle for b12 injections im injection Is this the right injections? : r/B12_Deficiency what size needle do you – Needle Size for a B12

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Our standard B12 for drips is methylcobalamin (generally thought to be the most absorbable form,) and we also carry cyanocobalamin for anyone who is sensitive to methylated B vitamins

The NICE recommendations tell GPs to consider testing in anyone with one symptom or one risk factor, and to treat early to prevent neurological damage that can become permanent

27 May 2026 8 min B12 injections: who actually needs them and how often

Other factors include: Underlying cause of deficiency : Pernicious anaemia, malabsorption disorders, or dietary insufficiency may affect treatment response Medication use : Metformin and proton pump inhibitors can reduce gastrointestinal B12 absorption (though this does not affect the efficacy of intramuscular injections) Individual variation : Differences in how efficiently your body utilises the injected vitamin Adherence to treatment schedule : Missing injections or delaying maintenance doses can slow recovery Discussing these factors with your healthcare provider helps set realistic expectations for your treatment journey