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Frontiers | Efficacy of sublingual and oral vitamin B12 versus intramuscular administration: insights from a systematic review and meta-analysis

Headaches or Lightheadedness: A small number of people might report mild headaches or feel a bit lightheaded for a short time, particularly right after an injection

B12 injection for anemia

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Screening may be warranted in patients with one or more risk factors, such as gastric or small intestine resections, inflammatory bowel disease, use of metformin for more than four months, use of proton pump inhibitors or histamine H 2 blockers for more than 12 months, vegans or strict vegetarians, and adults older than 75 years