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Bioavailability: 1 to 2% absorbed passively without intrinsic factor Deficiency: only if GI absorption is intact Dosing: daily, high-dose oral Prescription: no, available OTC At home: yes Get a B12 injection prescription Not sure which format fits your situation

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Patients with malabsorption syndromes or post-bariatric surgery

Isoniazid (INH), a tuberculosis medication, and hydralazine, used for hypertension, both form complexes with pyridoxal 5-phosphate or otherwise interfere with vitamin B metabolism, leading to functional vitamin B deficiency