Comment on

• Folic acid source, usual intake, and folate and vitamin B-12 status in US adults: National Health and Nutrition Examination Survey (NHANES) 2003-2006.

  Yang Q, Cogswell ME, Hamner HC, Carriquiry A, Bailey LB, Pfeiffer CM, Berry RJ. Yang Q, et al. Am J Clin Nutr. 2010 Jan;91(1):64-72. doi: 10.3945/ajcn.2009.28401. Epub 2009 Oct 14. Am J Clin Nutr. 2010. PMID: 19828716
• Total folate and folic acid intake from foods and dietary supplements in the United States: 2003-2006.

  Bailey RL, Dodd KW, Gahche JJ, Dwyer JT, McDowell MA, Yetley EA, Sempos CA, Burt VL, Radimer KL, Picciano MF. Bailey RL, et al. Am J Clin Nutr. 2010 Jan;91(1):231-7. doi: 10.3945/ajcn.2009.28427. Epub 2009 Nov 18. Am J Clin Nutr. 2010. PMID: 19923379 Free PMC article.