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First , I ask the patient, and check their records, for: a
A much more common cause of B12 deficiency, especially in older people, is a lack of stomach acid, because stomach acid is needed to liberate vitamin B12 from food
Vitamin B12 deficiency is typically accompanied by fatigue, weakness, loss of appetite, and constipation
Clinical laboratories generally define vitamin B12 deficiency as a serum level below 148 pmol/L, which is approximately 200 pg/mL
