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For patients whose levels fall in the borderline or gray zone, a methylmalonic acid (MMA) test provides greater specificity MMA levels rise when B12 is functionally inadequate at the cellular level, even if serum B12 appears borderline normal
This often makes oral supplements insufficient
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The answer isnt one-size-fits-allit depends on the severity of the deficiency, the treatment method, and how well your body responds
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