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What do systematic reviews say?

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Evidence found and GRADE certainty

3,535 questions · 3,601 findings · 252 reviews · Pregnancy and Childbirth

No studies found 726 · 20.2%GRADE not reported 421 · 11.7%Very low 828 · 23%Low 993 · 27.6%Moderate 486 · 13.5%High 147 · 4.1%

Vitamin A supplementation (200,000 to 400,000 IU) vs placebo or no treatment

Adverse effects on women: abdominal cramps · women in the postpartum period

Vitamin A supplementation (200,000 to 400,000 IU) showed no clear difference in maternal adverse effects after administration: abdominal pain compared with placebo or no treatment (low certainty).

1 finding from 1 review