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methylmalonic acid

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  • New Vitamin B12 Test
    New Vitamin B12 Test
    Who should get tested for vitamin B12 (cobalamin) deficiency and which is the best test to use: serum B12, methylmalonic acid (MMA), or holotranscobalamin levels?
  • Vitamin B12 Recommendation Change
    Vitamin B12 Recommendation Change
    Based on two biomarkers of functional vitamin B12 (cobalamin) status, B12 recommendations formulated more than a half century ago may need to be updated.