Findings

What do systematic reviews say?

4 questions · 4 findings · 1 reviews

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No studies found 0 · 0%GRADE not reported 0 · 0%Very low 0 · 0%Low 4 · 100%Moderate 0 · 0%High 0 · 0%

A dose of vitamin D 4000 IU/d or more vs 3999 IU/d or less alone or with any other nutrient

Pre‐eclampsia · women during pregnancy

A dose of vitamin D 4000 IU/d or more showed no clear difference in pre‐eclampsia compared with 3999 IU/d or less alone or with any other nutrient (low certainty).

1 finding from 1 review

Regimens of vitamin D supplementation for women during pregnancy 2019 · Cochrane Headline outcomes only
RR 0.87 [0.62, 1.22]
4 studies · 1903 participants
Low

A dose of vitamin D 4000 IU/d or more vs 3999 IU/d or less alone or with any other nutrient

Gestational diabetes · women during pregnancy

A dose of vitamin D 4000 IU/d or more showed no clear difference in gestational diabetes compared with 3999 IU/d or less alone or with any other nutrient (low certainty).

1 finding from 1 review

Regimens of vitamin D supplementation for women during pregnancy 2019 · Cochrane Headline outcomes only
RR 0.89 [0.56, 1.42]
5 studies · 2276 participants
Low

A dose of vitamin D 4000 IU/d or more vs 3999 IU/d or less alone or with any other nutrient

Preterm birth · women during pregnancy

A dose of vitamin D 4000 IU/d or more showed no clear difference in preterm birth compared with 3999 IU/d or less alone or with any other nutrient (low certainty).

1 finding from 1 review

Regimens of vitamin D supplementation for women during pregnancy 2019 · Cochrane Headline outcomes only
RR 0.85 [0.64, 1.12]
6 studies · 2948 participants
Low

A dose of vitamin D 4000 IU/d or more vs 3999 IU/d or less alone or with any other nutrient

Low birthweight · women during pregnancy

A dose of vitamin D 4000 IU/d or more showed no clear difference in low birthweight compared with 3999 IU/d or less alone or with any other nutrient (low certainty).

1 finding from 1 review

Regimens of vitamin D supplementation for women during pregnancy 2019 · Cochrane Headline outcomes only
RR 0.92 [0.49, 1.7]
2 studies · 1099 participants
Low