is it 3 years.old good take b12 injection Ethan Swanson, PharmD | Pharmacist | 💉 INJECTABLE VITAMIN — When Do You Actually Need the Shot? Not everyone needs a B12 — but for some patients, it's essential How Quickly Does Vitamin B12

Diagnosis typically involves blood tests including full blood count (showing macrocytosis), anti-intrinsic factor antibodies (which are specific for pernicious anaemia), and sometimes anti-parietal cell antibodies

Further, long-term use of acid-reducing drugs and the anti-diabetes drug metformin and repeated exposure to nitrous oxide have been implicated in vitamin B 12 deficiency (see Drug interactions)

Immediate medical attention is required for such responses

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Intravenous B12 bypasses the digestive system completely, delivering the vitamin straight to your bloodstream where your cells can use it immediately