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X Fact
February 21, 2021
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Is There a Better Blood Test for B12 Deficiency Other Than a B12 Level?

Yes there is, and here is why. Measuring MMA has become recognized as the best way to determine functional B12 status at a cellular level. The reason for this is that vitamin B12 (in the form of adenosylcobalamin) acts as a co-factor for an enzyme called methylmalonylCoA mutase (MCM), which converts methylmalonyl CoA to succinyl CoA within the mitochondria of the cell which is channeled into energy production. B12 is critical for energy production and if there is not enough to meet the energy needs, then the methylmalonic acid (MMA) that is needed as the starting material for this reaction starts to accumulate in the cell and will overflow into the blood circulation. Usually we can measure a small amount of MMA in the blood, but when B12 availability is low in the cell, then this shows up as an elevated MMA level in the blood.

Now it should make sense that measuring MMA in the blood should give us a very accurate measure of the cellular B12 status, and it does, when compared to the routinely measured vitamin B12 level in blood. But is testing it in the blood, the most accurate way of measuring MMA? More on that here.

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Who Wrote This X Fact
Jonathan Bortz MD
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Jonathan’s background as a practicing diabetes specialist for 15 years and 17-year career developing nutritional prescriptive products for the pharmaceutical industry has contributed to his ability to understand nutrients, how they work and why they are important.

Over the years he has acquired broad and in-depth knowledge in minerals, essential fatty acids and other nutrients, but has special expertise in Vitamin B12 and choline metabolism. He is often asked to speak at national and international venues to articulate why B12, folate and choline are so important to gene function, brain development, liver and cardiovascular health. He applies pharmaceutical standards to nutrient science and has developed a unique ability to translate complicated concepts into simple promotional messages that resonate with practitioners and consumers. He has developed dozens of innovative nutritional products, of which many are category leaders in the US. Jonathan obtained his medical degree from the University of the Witwatersrand Medical School in South Africa and did his fellowship in Endocrinology at Washington University in St. Louis, MO.

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