Vitamin B12 Benefits and Best Sources Vitamin B12 Deficiency: Symptoms, Causes & Treatment B12 deficiency can damage your nervous system with a completely normal blood count. In a landmark NEJM study, 28% of patients with neuropsychiatric B12 damage had no anemia or macrocytosis. B12 runs Why Does Nitrous Oxide Cause B12 Deficiency? [2026 Update] King Law
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