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You may not get enough B12 in your diet if you are: Vegan Vegetarian Over 50 Living with digestive conditions that affect nutrient absorption, such as IBS, celiac, or Crohns disease Taking certain medications like metformin or proton pump inhibitors (PPIs) What are the symptoms of B12 deficiency

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Marcocci C, Bartalena L, Rocchi R, Marin M, Menconi F, Morabito E, Mazzi B, Mazzeo S, Sartini MS, Nardi M, Cartei F, Cionini L, Pinchbera A 2003 Long-term safety of orbital radiotherapy for Graves ophthalmopathy