Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

193 questions · 195 findings · 93 reviews

No studies found 39 · 20%GRADE not reported 18 · 9.2%Very low 50 · 25.6%Low 40 · 20.5%Moderate 33 · 16.9%High 15 · 7.7%

Summary of findings table ‐ immunostimulant vs placebo

Side effects or other adverse events · adults with chronic bronchitis or chronic obstructive pulmonary disease

Summary of findings table ‐ immunostimulant showed no clear difference in adverse events/side effects compared with placebo (high certainty).

1 finding from 1 review