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Methylmalonic Acid (MMA) Test: Doesnt check B12 directly, but if MMA is high, it usually means your body isnt absorbing/using B12 properly, even if your B12 levels look normal

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Vitamin B12 deficiency Vitamin B12 deficiency is seen more frequently in: People who follow diets that do not have enough vitamin B12 (vegetarian and vegan diets are two examples)

Individuals who benefit most from B12 shots for diagnosed deficiency are patients with conditions that impair gastrointestinal absorption, such as pernicious anemia, tropical sprue, or pancreatic insufficiency