American journal of obstetrics and gynecology
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Am. J. Obstet. Gynecol. · Feb 2013
Randomized Controlled Trial Multicenter StudyA randomized trial of vitamin D supplementation in 2 community health center networks in South Carolina.
We sought to determine whether 4000 IU/d (vs 2000 IU/d) of vitamin D during pregnancy is safe and improves maternal/neonatal 25-hydroxyvitamin D [25(OH)D] in a dose-dependent manner. ⋯ Maternal supplementation with vitamin D 2000 and 4000 IU/d during pregnancy improved maternal/neonatal vitamin D status. Evidence of risk reduction in infection, preterm labor, and preterm birth was suggestive, requiring additional studies powered for these endpoints.