Findings

What do systematic reviews say?

4 questions · 4 findings · 3 reviews

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No studies found 1 · 25%GRADE not reported 0 · 0%Very low 2 · 50%Low 0 · 0%Moderate 0 · 0%High 1 · 25%

Vitamin A vs placebo

Adverse events · children up to the age of 7 at risk of upper respiratory tract infection

1 finding from 1 review

Oral vitamin A supplements to prevent acute upper respiratory tract infections in children up to seven years of age 2024 · Cochrane Headline outcomes only
no estimate extracted
1 study · 116 participants
Very low

Vitamin D vs placebo or usual care

Serious adverse events · individuals with moderate to severe disease

The review found no eligible studies for this question.

1 finding from 1 review

Vitamin D supplementation for the treatment of COVID‐19: a living systematic review 2021 · Cochrane Headline outcomes only
no estimate extracted
Studies not reported
No studies found

Vitamin D vs placebo or usual care

Adverse events: all grades · individuals with moderate to severe disease

It is very uncertain whether summary of Findings Table ‐ Vitamin D changes adverse events (any grade) compared with placebo or standard care alone (very low certainty).

1 finding from 1 review

Vitamin D supplementation for the treatment of COVID‐19: a living systematic review 2021 · Cochrane Headline outcomes only
RR 2.98 [0.12, 72.3]
1 study · 237 participants
Very low

Vitamin D vs placebo

Proportion of participants with one or more serious adverse events due to any cause · children and adults with predominantly mild to moderate asthma

Summary of findings table ‐ Vitamin D showed no clear difference in proportion of participants with one or more serious adverse events… compared with placebo (high certainty).

1 finding from 1 review

Vitamin D for the management of asthma 2023 · Cochrane Headline outcomes only
OR 0.89 [0.56, 1.41]
12 studies · 1556 participants
High