Key dietary sources of B12 include: Meat Eggs Dairy products Fortified breakfast cereals Other fortified foods These foods provide B12 naturally or are fortified during processing to help prevent dietary deficiencies
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
B12 is indispensable for a healthy immune system due to its involvement in critical functions
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Nature Communications , 10 (1), 1-13