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%

Vitamin D vs placebo or control

Maternal vitamin D concentration at term (25‐hydroxyvitamin D) (nmol/L) (ALL) · pregnant women

Meta-analysis of randomised trials of vitamin D supplementation for Maternal vitamin D concentrations at term: WMD 47.08 (95% CI 23.76 to 70.39), statistically significant. Umbrella review outcome-level evidence grade: Probable.

1 finding from 1 review

Vitamin D given to infants vs vitamin D given to lactating mothers

Hypercalcaemia · term breastfed infants to prevent vitamin D deficiency and improve bone health

Vitamin D given to infants showed no clear difference in adverse effect (hypercalcaemia) compared with vitamin D given to lactating mothers (low certainty).

1 finding from 1 review

Antioxidants vs placebo

Cognitive function · cognitively healthy people in mid and late life
6 findings from 1 review
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Neonatal vitamin A supplementation vs control

Vitamin A deficiency · mortality and morbidity in term neonates

Neonatal vitamin A supplementation showed no clear difference in vitamin A deficiency (serum retinol < 0.70 micromol/L) at 6 weeks of… compared with control (high certainty).

2 findings from 1 review