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Workshop on Metabolic Interactions between Folic Acid Excess and Vitamin B12 Deficiency

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Event Details


One-carbon metabolism is a crucial network of pathways involved in cellular methylation reactions and nucleotide biosynthesis. The network is regulated by and dependent on several micronutrients. Of these, folate (Vitamin B9) and vitamin B12 play central roles as cofactors in the network. In the last two decades, folic acid fortification policies and voluntary supplementation have increased folic acid intake. The cumulative folic acid intake from fortification, supplementation, diet and other sources can easily exceed the upper limit set forth for folic acid (1000 μg/day). Some observational studies suggest an interaction between elevated folate/folic acid levels and vitamin B12 metabolism, raising the concern that high folate/folic acid status may exacerbate biomarkers of vitamin B12 deficiency and cognitive decline in older adults taking multivitamin supplements. Another growing concern is the appearance of unmetabolized folic acid in nearly all serum samples from US populations, as seen in the NHANES screening program. The biological activity or longtime health implications of higher unmetabolized folic acid exposures are not clear. The biological premise and experimental evidence for establishing a causal effect for the consequences of elevated folic acid intake and the role of high folate status in modifying the effects of vitamin B12 deficiency are lacking, and most animal and in vitro studies aimed at addressing this issue have suffered from experimental study design limitations. Research consensus on the approaches to investigate folate/folic acid -vitamin B12 interactions are urgently needed to assess the safety aspects associated with potential excess intake of folic acid.


Main objectives of the workshop are to deliberate on the potential causal mechanisms of excess folate/folic acid and Vit B12 deficiency, as well as potential biological effects of unmetabolized folic acid and to develop consensus on various basic and clinical experimental study designs, intervention strategies and experimental models, for exploring the biochemical mechanisms for these interactions.

Planning Members

Padma Maruvada (NIH/NIDDK)
Christopher Lynch (NIH/NIDDK)
Sharon Ross (NIH/NCI)
Giovanna Zappala (NIH/NIA)
Dan Raiten (NIH/NICHD)
Drew Bremer (NIH/NICHD)
Cindy Davis (NIH/ODS)
Nancy Potischman (NIH/ODS)
Essie Yamini (FDA/CFSA)
David Klurfeld (USDA/ARS)


Patrick Stover (Texas A&M University)
Joel Mason (Tufts University)

Registration Deadline

July 30, 2019

Event Logistics


Registration Closed
Registration ended


Hyatt Regency Bethesda
7400 Wisconsin Avenue
Bethesda, MD 20814

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Program Contacts
Padma Maruvada
T: 301-594-8884

Meeting Logistics
Danielle Johnikin
The Scientific Consulting Group, Inc.
T: 301-670-4990

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