Major cardiovascular event Physicians · middle‐aged US male physicians
Vitamin C supplementation showed no clear difference in major cardiovascular event Physicians compared with placebo (low certainty).
1 finding from 1 review
Cardiovascular mortality Physicians · middle‐aged US male physicians
It is very uncertain whether vitamin C supplementation changes cardiovascular mortality Physicians compared with placebo (very low certainty).
1 finding from 1 review
All‐cause mortality Physicians · middle‐aged US male physicians
It is very uncertain whether vitamin C supplementation changes all‐cause mortality Physicians compared with placebo (very low certainty).
1 finding from 1 review
Fatal or nonfatal myocardial infarction · middle‐aged US male physicians
Vitamin C supplementation showed no clear difference in total myocardial infarction (fatal and non‐fatal) Physicians compared with placebo (low certainty).
1 finding from 1 review
Stroke · middle‐aged US male physicians
Vitamin C supplementation showed no clear difference in total stroke (fatal and non‐fatal) Physicians compared with placebo (low certainty).
1 finding from 1 review
Self‐reported CABG/PTCA Participant self‐reports · middle‐aged US male physicians
Vitamin C supplementation showed no clear difference in self‐reported CABG/PTCA Participant self‐reports compared with placebo (low certainty).
1 finding from 1 review
Self‐reported angina Participant self‐reports · middle‐aged US male physicians
Vitamin C supplementation showed no clear difference in self‐reported angina Participant self‐reports compared with placebo (low certainty).
1 finding from 1 review
Vitamin A deficiency · children aged between 6 months and 5 years
Vitamin A supplementation probably leads to lower vitamin A deficiency compared with placebo or usual care (moderate certainty).
1 finding from 1 review
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
WMD 47.08 [23.76, 70.39]
4 studies
GRADE not reported
Maternal vitamin B12 deficiency · pregnant women
It is very uncertain whether summary of findings table ‐ Vitamin B12 supplementation changes maternal vitamin B12 deficiency compared with placebo/no vitamin B12 supplementation (very low certainty).
1 finding from 1 review
Health‐related quality of life (HRQL) · people with asthma
1 finding from 1 review
Adverse events · adults and children with exercise‐induced bronchoconstriction/asthma
The review found no eligible studies for this question.
1 finding from 1 review
no estimate extracted
Studies not reported
No studies found
Asthma exacerbations · people with asthma
1 finding from 1 review
Lung function: FEV1 mL (change from baseline) · people with asthma
1 finding from 1 review
Asthma symptoms · people with asthma
1 finding from 1 review
Adverse events · people with asthma
1 finding from 1 review
Health‐related quality of life (HRQL) · adults and children with exercise‐induced bronchoconstriction/asthma
The review found no eligible studies for this question.
1 finding from 1 review
no estimate extracted
Studies not reported
No studies found
Asthma exacerbations · adults and children with exercise‐induced bronchoconstriction/asthma
The review found no eligible studies for this question.
1 finding from 1 review
no estimate extracted
Studies not reported
No studies found
Lung function: FEV1 % drop Postexercise · adults and children with exercise‐induced bronchoconstriction/asthma
1 finding from 1 review
no estimate extracted
1 study · 8 participants
Low
Asthma symptoms · adults and children with exercise‐induced bronchoconstriction/asthma
1 finding from 1 review
no estimate extracted
1 study · 8 participants
Low