What Causes B12 Deficiency?

A contributing factor, which causes B12 deficiency, can be a malabsorption problem. However, there are other possible causes that can lead to a Vitamin B12 deficiency, including a diet low in Vitamin B12 foods, low stomach acidity, and Crohn's disease. You can find more information here: http://www.nlm.nih.gov/medlineplus/ency/article/000574.htm
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