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If you are following a vegan diet, it may be helpful to eat fortified foods such as fortified non-dairy milk, fortified cereal, or fortified nutritional yeast

Other possible causes of a vitamin B12 deficiency pernicious anemia prolonged use of certain medications, such as metformin following a strict vegan or vegetarian diet certain infections, such as with the tapeworm Diphyllobothrium latum celiac disease older age high intake of alcohol Other nutritional supplements may also benefit someone with Crohns disease

The liver is the main organ for vitamin B12 storage

Yes, although rare, allergic reactions like rash, itching, or swelling can occur