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Vitamin Supplement

Serum unmetabolized folic acid in a nationally representative sample of adults ≥60 years in the United States, 2001–2002

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Article: 5616 | Published online: 02 Apr 2012

Figures & data

Fig. 1.  The percentage of US adults (≥60 years) without (−UMFA) and with (+UMFA) detectable concentrations of unmetabolized serum folic acid by quartiles of serum 5-methyltetrahydrofolate (5-methylTHF) concentrations (A), quartiles of total folic acid intake (B).