Findings

What do systematic reviews say?

2 questions · 2 findings · 1 reviews · Acute Respiratory Infections

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

Vitamin C vs placebo

Adverse effects · children under 5 years of age

The review found no eligible studies for this question.

1 finding from 1 review

Vitamin C supplementation for prevention and treatment of pneumonia 2021 · Cochrane Headline outcomes only
no estimate extracted
Studies not reported
No studies found

Vitamin C vs placebo

Adverse effects (urticaria) Defined as participants reporting urticaria (hives) Dose: 2 g per day · school‐aged children (6 to 15 years) and marine corps recruits (mean age 18.5 years)

It is very uncertain whether vitamin C changes adverse effects (urticaria) Defined as participants reporting… compared with placebo (very low certainty).

1 finding from 1 review

Vitamin C supplementation for prevention and treatment of pneumonia 2021 · Cochrane Headline outcomes only
RR 3.11 [0.13, 76.03]
1 study · 674 participants
Very low