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10.1093/ajcn/77.2.406 102 OstrakhovitchE

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

Unexpected Actions of Vitamin D: New Perspectives on the Regulation of Innate and Adaptive Immunity

Then there are those who simply want to try something else before committing to a long-term prescription

The tetrahydrofolate from this reaction plays a crucial role in the production of purines required for DNA synthesis and the development of reticulocytes [19]
