how quickly does a b12 injection work Shot Work? What to Expect b12 injections saved my life

in those patients with dietary deficiency) in the terminal ileum

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Vitamin B12 injections are commonly given intramuscularly or deep subcutaneously, depending on the product label and clinical direction

The cumulative effect builds over 2 to 4 weeks of consistent injections, which is why Triny typically recommends a loading phase before transitioning to monthly maintenance