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methylmalonic acid
2 articles in this field-note collection.
Methylmalonic acid (MMA) test: normal range and high causes
Methylmalonic acid (MMA) shows whether vitamin B12 is working inside your cells. Normal levels, common causes of a high result, and how to read it with B12.
Vitamin B12 test: what low, normal and high levels mean
Vitamin B12 keeps your nerves and red blood cells healthy. Here's a normal level, why it runs low, how MMA settles a borderline result, and when to act fast.