Vitamin D Supplementation and Sun Exposure Maintain Blood Pressures of Pregnant Women and Increase Birth Weight in a Randomized Controlled Trial.

Background: Vitamin D supplementation or sun exposure increase pregnant women's Calcidiol levels, lower the blood pressures and increase birth weight. We aimed to compare the effects between sun exposure and vitamin D supplementation on pregnant women's Calcidiol levels, blood pressures and newborns' anthropometric indices.

Methods: This randomized clinical trial was conducted on 108 pregnant women at 20 wk of gestation on 2021's dry season in Semarang City, Indonesia.