Findings

What do systematic reviews say?

26 questions · 26 findings · 4 reviews

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No studies found 7 · 26.9%GRADE not reported 0 · 0%Very low 2 · 7.7%Low 15 · 57.7%Moderate 2 · 7.7%High 0 · 0%

Vitamin D (higher dose) + micronutrient(s) vs vitamin D (lower dose) + micronutrient(s)

Adverse effect: kidney stonesb · children under 5 years of age

The review found no eligible studies for this question.

1 finding from 1 review

Effects of oral vitamin D supplementation on linear growth and other health outcomes among children under five years… 2020 · Cochrane Headline outcomes only
no estimate extracted
Studies not reported
No studies found

A dose of vitamin D 601 IU or higher vs 600 IU or lower alone or with other nutrients

Pre‐eclampsia · women during pregnancy

A dose of vitamin D 601 IU or higher showed no clear difference in pre‐eclampsia compared with 600 IU or lower alone or with other nutrients (low certainty).

1 finding from 1 review

Regimens of vitamin D supplementation for women during pregnancy 2019 · Cochrane Headline outcomes only
RR 0.96 [0.65, 1.42]
5 studies · 1553 participants
Low

A dose of vitamin D 601 IU or higher vs 600 IU or lower alone or with other nutrients

Gestational diabetes · women during pregnancy

A dose of vitamin D 601 IU or higher probably leads to lower gestational diabetes compared with 600 IU or lower alone or with other nutrients (moderate certainty).

1 finding from 1 review

Regimens of vitamin D supplementation for women during pregnancy 2019 · Cochrane Headline outcomes only
RR 0.54 [0.34, 0.86]
5 studies · 1846 participants
Moderate

A dose of vitamin D 601 IU or higher vs 600 IU or lower alone or with other nutrients

Preterm birth · women during pregnancy

A dose of vitamin D 601 IU or higher showed no clear difference in preterm birth compared with 600 IU or lower alone or with other nutrients (low certainty).

1 finding from 1 review

Regimens of vitamin D supplementation for women during pregnancy 2019 · Cochrane Headline outcomes only
RR 1.25 [0.92, 1.69]
4 studies · 2294 participants
Low

A dose of vitamin D 601 IU or higher vs 600 IU or lower alone or with other nutrients

Low birthweight · women during pregnancy

It is very uncertain whether A dose of vitamin D 601 IU or higher changes low birthweight compared with 600 IU or lower alone or with other nutrients (very low certainty).

1 finding from 1 review

Regimens of vitamin D supplementation for women during pregnancy 2019 · Cochrane Headline outcomes only
RR 0.9 [0.66, 1.24]
4 studies · 1550 participants
Very low

High‐dose vs low‐dose coenzyme Q10 and vitamin E

Short‐term (within 1 month) change in isolated movement, objective and subjective measures of speech production Cooper 2008 reported 3 speech measures: ICARS speech subscale. Scale from: 0 to 8. Higher scores indicate greater clinical severity Syl... · people with speech disorder resulting from hereditary ataxias

1 finding from 1 review

Treatment for speech disorder in Friedreich ataxia and other hereditary ataxia syndromes 2014 · Cochrane Headline outcomes only
no estimate extracted
1 study · 43 participants
Low