What do systematic reviews say?

1 questions · 1 findings · 1 reviews · Pregnancy and Childbirth

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No studies found 0 · 0%GRADE not reported 0 · 0%Very low 0 · 0%Low 1 · 100%Moderate 0 · 0%High 0 · 0%

Vitamin D plus calcium vs placebo or no intervention

Preterm birth · pregnant women and their infants..

Vitamin D + calcium supplementation may leads to higher preterm birth (less than 37 weeks' gestation) compared with placebo or no intervention (low certainty).

1 finding from 1 review

Vitamin D supplementation for women during pregnancy 2019 · Cochrane Headline outcomes only
RR 1.52 [1.01, 2.28]
5 studies · 942 participants
Low