Do high blood folate concentrations exacerbate metabolic abnormalities in people with low vitamin B-12 status?

Does high folic acid intake affect unrecognized cobalamin deficiency, and how will we know it if we see it?

(2009) Ralph Carmel   AMERICAN JOURNAL OF CLINICAL NUTRITION

Metabolic evidence of vitamin B-12 deficiency, including high homocysteine and methylmalonic acid and low holotranscobalamin, is more pronounced in older adults with elevated plasma folate

(2009) Joshua W Miller et al.   AMERICAN JOURNAL OF CLINICAL NUTRITION

Folate–vitamin B-12 interaction in relation to cognitive impairment, anemia, and biochemical indicators of vitamin B-12 deficiency

(2009) Jacob Selhub et al.   AMERICAN JOURNAL OF CLINICAL NUTRITION

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

(2009) Quanhe Yang et al.   AMERICAN JOURNAL OF CLINICAL NUTRITION

Folate and vitamin B12 status in relation to cognitive impairment and anaemia in the setting of voluntary fortification in the UK

(2008) Robert Clarke et al.   BRITISH JOURNAL OF NUTRITION

Active B12: A Rapid, Automated Assay for Holotranscobalamin on the Abbott AxSYM Analyzer

(2008) J. Brady et al.   CLINICAL CHEMISTRY