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BioMed Research International
Volume 2014, Article ID 481914, 8 pages
Review Article

Folic Acid Supplementation and Preterm Birth: Results from Observational Studies

1Sezione di Ostetricia e Ginecologia, Dipartimento di Scienze della Vita e della Riproduzione, Università degli Studi di Verona, Piazzale Ludovico Scuro 10, 37134 Verona, Italy
2Azienda Ospedaliera Universitaria Integrata Verona, Piazzale Stefani 1, 37126 Verona, Italy

Received 18 November 2013; Revised 1 January 2014; Accepted 1 January 2014; Published 3 March 2014

Academic Editor: Allegaert Karel

Copyright © 2014 Elena Mantovani et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Introduction. Folic acid (FA) supplementation is recommended worldwide in the periconceptional period for the prevention of neural tube defects. Due to its involvement in a number of cellular processes, its role in other pregnancy outcomes such as miscarriage, recurrent miscarriage, low birth weight, preterm birth (PTB), preeclampsia, abruptio placentae, and stillbirth has been investigated. PTB is a leading cause of perinatal mortality and morbidity; therefore its association with FA supplementation is of major interest. The analysis of a small number of randomized clinical trials (RCTs) has not found a beneficial role of FA in reducing the rate of PTBs. Aim of the Study. The aim of this review was to examine the results from recent observational studies about the effect of FA supplementation on PTB. Materials and Methods. We carried out a search on Medline and by manual search of the observational studies from 2009 onwards that analyzed the rate of PTB in patients who received supplementation with FA before and/or throughout pregnancy. Results. The results from recent observational studies suggest a slight reduction of PTBs that is not consistent with the results from RCTs. Further research is needed to better understand the role of FA supplementation before and during pregnancy in PTB.