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References Institute of Medicine (US) Standing Committee on the Scientific Evaluation of Dietary Reference Intakes
Z Rheumatol
Deficiency is particularly common in elderly people, because the ability to absorb vitamin B12 can decrease with age ( Other people at risk of deficiency include those who have had intestinal surgery, including weight loss surgery
However, in rare cases, more serious side effects can occur, such as anaphylactic shock, which can be life-threatening
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