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Certain factors may put you at increased risk for B12 deficiencyincluding a vegetarian or vegan diet, specific medical conditions (such as Crohns or celiac disease, or a history of gastric surgery), and age over 50
3 The UK National Institute for Health and Care Excellence (NICE) states that a cut-off of 200 ng/l identifies 97% of people with B12 deficiency, and a level below 100 ng/l is usually accompanied by metabolic or clinical evidence of B12 deficiency
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