Vitamin D supplementation during pregnancy: an overview

Area of Science:

• Obstetrics and Gynecology
• Nutritional Science
• Pediatrics

Background:

• Maternal serum 25-hydroxyvitamin D [25(OH)D] levels naturally decrease during pregnancy.
• Low maternal vitamin D is linked to adverse infant outcomes like lower bone mineral content and developmental issues.

Purpose of the Study:

• To review recent evidence on maternal vitamin D status and supplementation effects on obstetrical and offspring outcomes.
• To evaluate randomized controlled trials and meta-analyses concerning vitamin D in pregnancy.

Main Methods:

• Systematic review of recent randomized controlled trials.
• Analysis of meta-analyses investigating vitamin D supplementation in pregnant women.

Main Results:

• Vitamin D supplementation may improve fetal growth and reduce risks of preeclampsia, preterm birth, and gestational diabetes.
• Adequate maternal vitamin D is associated with fewer infant enamel defects and reduced risk of ADHD and autism.
• Higher doses (1000-4000 IU/day) may offer enhanced maternal and infant benefits.

Conclusions:

• Vitamin D supplementation during pregnancy is supported by strong evidence for improving maternal and infant health.
• All pregnant women should receive at least 600 IU/day of vitamin D3.
• Further research into optimal dosing for enhanced outcomes is warranted.