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Malabsorption : Some people may have difficulty absorbing vitamin B12 from the diet due to certain medical conditions or the use of certain medications, such as proton pump inhibitors (PPIs) or H2 blockers, which reduce stomach acid production

Limited data indicate vitamin B12 deficiency may contribute to menstrual irregularities (but more study is needed)

Growth, body composition, and cardiovascular and nutritional risk of 5- to 10-y-old children consuming vegetarian, vegan, or omnivore diets

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The Schilling test is now considered obsolete with reliance on blood tests taking its place