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Genetic variants in B12 metabolism pathways (e.g., MTHFR, MTR, MTRR genes) can influence how efficiently your body processes and utilizes B12, potentially affecting both side-effect risk and clinical benefit
2 The Schilling test, which was once the diagnostic standard for pernicious anemia, is no longer available in the United States
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Dietary sources of B12, such as meat, fish, and dairy products, provide most people with enough of the vitamin
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