Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

1,126 questions · 1,225 findings · 111 reviews

No studies found 235 · 19.2%GRADE not reported 260 · 21.2%Very low 207 · 16.9%Low 271 · 22.1%Moderate 177 · 14.4%High 75 · 6.1%

Dietary supplements vs placebo

Dill seed versus placebo Pain score · women with moderate or severe primary dysmenorrhoea
3 findings from 1 review

Intervention not reported

Vitamin C adherence · Various (pregnant women; daily smokers aged 16 and older; university students; children aged 5‐13)
1 finding from 1 review

Intervention not reported

Stillbirth · All pregnant women receiving either vitamin C supplementation or control either in areas where there is inadequate dietary intake or where…

The intervention showed no clear difference in stillbirth (moderate certainty).

1 finding from 1 review