Vitamin D and its role during pregnancy in attaining optimal health of mother and fetus.

Even in the latter trial where women were randomized to either 2000 IU (50 μg) or 4000 IU (100 μg) vitamin D 3 /day, there were no safety issues surrounding vitamin D supplementation and there was a trend where specific health complications of pregnancy such as preterm birth, preterm labor, hypertensive orders of pregnancy, gestational diabetes, and infection were higher in the 400 IU-compared with the 4000 IU-group, but did not reach statistical significance [ 149 ].

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