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Updated: Apr 3, 2026

Author Spotlight: Studying the Impact of Maternal Dietary Deficiencies on Long-Term Offspring Health Outcomes
Published on: June 28, 2024
Vitamin B-12 and Perinatal Health
Julia L Finkelstein1, Alexander J Layden2, Patrick J Stover2
1Division of Nutritional Sciences, Cornell University, Ithaca, NY; and St. John's Research Institute, St. John's National Academy of Health Sciences, Bangalore, India jfinkelstein@cornell.edu.
Insights
Maternal vitamin B-12 deficiency is linked to serious pregnancy and infant health issues. More research is crucial to understand these links and guide public health interventions for better outcomes.
Area of Science:
- Obstetrics and Gynecology
- Maternal-Fetal Medicine
- Nutritional Science
Background:
- Vitamin B-12 deficiency (<148 pmol/L) is prevalent and linked to adverse maternal and neonatal outcomes.
- Adequate vitamin B-12 is critical for neural myelination, fetal brain development, and growth.
- Maternal insufficiency (<200 pmol/L) can cause irreversible infant developmental impairments.
Purpose of the Study:
- To review existing evidence linking maternal vitamin B-12 status to perinatal outcomes.
- To highlight the need for further research into the causal mechanisms of these associations.
Main Methods:
- Literature review of studies examining maternal vitamin B-12 status and perinatal outcomes.
- Analysis of evidence from prospective studies and randomized trials.
Main Results:
- Few prospective studies and only one randomized trial have investigated vitamin B-12 supplementation during pregnancy.
- Existing evidence suggests a strong association between vitamin B-12 deficiency and adverse pregnancy and neonatal outcomes.
Conclusions:
- The precise role of vitamin B-12 in the etiology of adverse perinatal outcomes requires further elucidation.
- Understanding these mechanisms is essential for developing effective public health interventions.
Abstract:
Vitamin B-12 deficiency (<148 pmol/L) is associated with adverse maternal and neonatal outcomes, including developmental anomalies, spontaneous abortions, preeclampsia, and low birth weight (<2500 g). The importance of adequate vitamin B-12 status periconceptionally and during pregnancy cannot be overemphasized, given its fundamental role in neural myelination, brain development, and growth. Infants born to vitamin B-12-deficient women may be at increased risk of neural tube closure defects, and maternal vitamin B-12 insufficiency (<200 pmol/L) can impair infant growth, psychomotor function, and brain development, which may be irreversible. However, the underlying causal mechanisms are unknown. This review was conducted to examine the evidence that links maternal vitamin B-12 status and perinatal outcomes. Despite the high prevalence of vitamin B-12 deficiency and associated risk of pregnancy complications, few prospective studies and, to our knowledge, only 1 randomized trial have examined the effects of vitamin B-12 supplementation during pregnancy. The role of vitamin B-12 in the etiology of adverse perinatal outcomes needs to be elucidated to inform public health interventions.
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