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Intramuscular (IM) B12 injections using hydroxocobalamin, the preferred licensed form in the UK are recommended when: Oral supplementation has failed to correct a documented deficiency The patient has difficulty adhering to daily oral regimens Serum B12 levels remain persistently low despite adequate oral dosing There is clinical evidence of neurological or haematological complications In line with BNF guidance, the standard IM regimen for confirmed deficiency without neurological involvement is a loading course of 1 mg hydroxocobalamin on alternate days for two weeks , followed by maintenance of 1 mg every three months

A migraine activates pain pathways and inflammatory signaling around the nerves and blood vessels of the head, which drives the throbbing pain

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If the intestines find it difficult to absorb and break down vitamin B12 from food sources, it can cause a deficiency

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You're experiencing any kind of infection