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These include: Older adults, as they absorb B12 less easily Vegetarians and vegans, because B12 is mostly in animal products People with stomach problems like celiac disease or Crohns disease Those who have had gastric bypass surgery Knowing these risk factors helps find who might need to check their B12 levels
D.JamesS
During these studies, researchers carefully tracked side effects experienced by participants
Eur J Clin Invest (2005) 35:56572
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