Unmetabolized serum folic acid and its relation to folic acid intake from diet and supplements in a nationally representative sample of adults aged ≥60 y in the United States

Circulating unmetabolized folic acid and 5-methyltetrahydrofolate in relation to anemia, macrocytosis, and cognitive test performance in American seniors

(2010) Martha Savaria Morris et al.   AMERICAN JOURNAL OF CLINICAL NUTRITION

Folate intake, post–folic acid grain fortification, and pancreatic cancer risk in the Prostate, Lung, Colorectal, and Ovarian Cancer Screening Trial

(2009) Brietta M Oaks et al.   AMERICAN JOURNAL OF CLINICAL NUTRITION

Total folate and folic acid intake from foods and dietary supplements in the United States: 2003–2006

(2009) Regan L Bailey et al.   AMERICAN JOURNAL OF CLINICAL NUTRITION

Persistent circulating unmetabolised folic acid in a setting of liberal voluntary folic acid fortification. Implications for further mandatory fortification?

(2009) Mary R Sweeney et al.   BMC PUBLIC HEALTH

Colon cancer in Chile before and after the start of the flour fortification program with folic acid

(2009) Sandra Hirsch et al.   EUROPEAN JOURNAL OF GASTROENTEROLOGY & HEPATOLOGY

Folic Acid and Risk of Prostate Cancer: Results From a Randomized Clinical Trial

(2009) J. C. Figueiredo et al.   JNCI-Journal of the National Cancer Institute

The extremely slow and variable activity of dihydrofolate reductase in human liver and its implications for high folic acid intake

(2009) S. W. Bailey et al.   PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA

Effect of Combined Folic Acid, Vitamin B6, and Vitamin B12on Cancer Risk in Women

(2008) Shumin M. Zhang et al.   JAMA-JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION

A 19-Base Pair Deletion Polymorphism in Dihydrofolate Reductase Is Associated with Increased Unmetabolized Folic Acid in Plasma and Decreased Red Blood Cell Folate

(2008) Renee D. Kalmbach et al.   JOURNAL OF NUTRITION