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Less common, whole-body effects
While known commonly as Vitamin B12 it does, in fact, exist in four very similar chemical forms, namely: Methylcobalamin Adenosylcobalamin Cyanocobalamin Hydroxocobalamin Methylcobalamin and Adenosylcobalamin are both naturally occurring co-enzymes that are found in food sources
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
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