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Description
Before receiving folic acid or methylcobalamin, patients should be assessed for deficiency and appropriate therapy started concurrently

Young, and S

Methylmalonic acid (MMA) : Elevated levels indicate functional B12 deficiency [*]

One potential explanation for this is that a necessary fuel for the conversion of NMN or NR to NAD+ is missing

oxysporum [59,60]

depending on individual factors, they generally last several months
