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The difference is in the research target
Methylmalonic acid (MMA) and homocysteine levels: These metabolites accumulate when B12 is deficient and can help confirm diagnosis when serum B12 is borderline
When you feel tired all the time, or more often than seems normal, theres a good chance youre struggling with a chronic form of fatigue, which can stem from a range of issues, including lifestyle choices or medical illnesses
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