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Strict vegetarians and vegans can run low on fortified foods or supplements
Some problems of the gut can also be a cause of vitamin B12 deficiency, but this is less uncommon, for example: surgery to remove parts of the bowel (the stomach or the end of the small intestine) Crohn's disease atrophic gastritis (where the lining of the stomach is thinned)
These tools do not replace provider instructions
Learn How An easy to follow step-by-step for intramuscular injections can be found on our How to Perform an Intramuscular Injection of Vitamin B12 page
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