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doi: 10.1001/jama.289.14.1820
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When you take a B12 pill, it has to go through your digestive system, where much of the vitamin can be lost before your body can use it
Blood test to determine the quantity and size of red blood cells as well as the level of vitamin B12 in the blood Schilling test to assess bodys ability of B12 absorption Biopsy of the stomach may be done to check for autoimmune gastritis, which can cause pernicious anemia These tests help to confirm the diagnosis of pernicious anemia and rule out other possible causes of anemia
[151] However, other than a report on case studies [151] there are no benefits confirmed in the scientific literature
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