Cancer occurrence · healthy participants or recruited among the general population; individuals diagnosed with a specific disease in a stable phase or with…
Vitamin D showed no clear difference in cancer occurrence compared with placebo or no intervention (moderate certainty).
1 finding from 1 review
All‐cause mortality · healthy participants or recruited among the general population; individuals diagnosed with a specific disease in a stable phase or with…
Vitamin D may leads to lower all‐cause mortality compared with placebo or no intervention (low certainty).
1 finding from 1 review
Health‐related quality of life · healthy participants or recruited among the general population; individuals diagnosed with a specific disease in a stable phase or with…
The review found no eligible studies for this question.
1 finding from 1 review
no estimate extracted
Studies not reported
No studies found
Health economics · healthy participants or recruited among the general population; individuals diagnosed with a specific disease in a stable phase or with…
The review found no eligible studies for this question.
1 finding from 1 review
no estimate extracted
Studies not reported
No studies found
Any adverse effects of vitamin supplementation sufficient to stop supplementation · pregnant women
Vitamin C and vitamin E showed no clear difference in any adverse effects of vitamin supplementation sufficient to stop… compared with placebo (moderate 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
Serum 25-hydroxyvitamin D level · people with sickle cell disease
1 finding from 1 review
Nutritional rickets‐ biochemical · term breastfed infants to prevent vitamin D deficiency and improve bone health
1 finding from 1 review
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
Intervention not reported
All‐cause mortality in trials using vitamin D3 (cholecalciferol) ( · adults
The intervention probably leads to lower all‐cause mortality in trials using vitamin D3 (cholecalciferol) ( (moderate certainty).
1 finding from 1 review
Intervention not reported
Cardiovascular mortality in trials using vitamin D3 (cholecalciferol) ( · adults
The intervention showed no clear difference in cardiovascular mortality in trials using vitamin D3… (low certainty).
1 finding from 1 review
Intervention not reported
Cancer mortality in trials using vitamin D3 (cholecalciferol) ( · adults
The intervention probably leads to lower cancer mortality in trials using vitamin D3 (cholecalciferol) ( (moderate certainty).
1 finding from 1 review
Intervention not reported
Adverse events: nephrolithiasis in trials using vitamin D3 combined with calcium ( · adults
The intervention probably leads to higher adverse events: nephrolithiasis in trials using vitamin D3 combined… (moderate certainty).
1 finding from 1 review
Total fetal loss (including miscarriages or combined miscarriages and stillbirths) · pregnant women
Vitamin A plus iron plus folate showed no clear difference in total fetal loss (including miscarriages or combined miscarriages… compared with iron plus folate (low certainty).
1 finding from 1 review
Early or late miscarriage · pregnant women
Vitamin A plus iron plus folate showed no clear difference in early or late miscarriage ‐ Vitamin A + iron + folate versus iron +… compared with iron plus folate (low certainty).
1 finding from 1 review
Stillbirth ‐ Vitamin A + iron + folate versus iron + folate · pregnant women
Vitamin A plus iron plus folate showed no clear difference in stillbirth ‐ Vitamin A + iron + folate versus iron + folate compared with iron plus folate (low certainty).
1 finding from 1 review
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
Early or late miscarriage · pregnant women
Multivitamin plus iron plus folate showed no clear difference in early or late miscarriage ‐ Multivitamin + iron + folic acid versus… compared with iron plus folate (moderate certainty).
1 finding from 1 review
Stillbirth ‐ Multivitamin + iron + folic acid versus iron + folic acid · pregnant women
Multivitamin plus iron plus folate leads to lower stillbirth ‐ Multivitamin + iron + folic acid versus iron + folic acid compared with iron plus folate (high certainty).
1 finding from 1 review