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How Fast Does Vitamin B12 Work How fast Vitamin B12 works depends on the delivery method and the severity of your deficiency
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Neurologic, cognitive, hematologic, or mucosal features can point to a shortfall, as can risk factors such as malabsorption, autoimmune gastritis, relevant medications, or nitrous oxide exposure
Drug-induced deficiencies (e.g., isoniazid, oral contraceptives)
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