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Vitamin B12 is an essential water-soluble vitamin that plays a role in many bodily functions, including:
Without vitamin B12, a person may start to feel tired and weak due to megaloblastic anemia.
Some people’s bodies do not produce enough stomach acid or intrinsic factor if they have a condition known as autoimmune atrophic gastritis. These people may need vitamin B12 shots to reduce their risk of deficiency, which can lead to pernicious anemia.
Other people who may needs shots include those who have had gastrointestinal surgery if their digestive system cannot absorb vitamin B12 efficiently.
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