Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

1,514 questions · 1,543 findings · 649 reviews

No studies found 224 · 14.5%GRADE not reported 105 · 6.8%Very low 383 · 24.8%Low 447 · 29%Moderate 293 · 19%High 91 · 5.9%

Probiotics vs placebo

Adverse events · Patients with collagenous colitis

It is very uncertain whether probiotics changes adverse events compared with placebo (very low certainty).

1 finding from 1 review

Homocysteine‐lowering interventions (Folic Acid, Vitamin B6 and Vitamin B12) vs placebo or usual care

Adverse events · people with or without existing cardiovascular disease, men and women

Homocysteine‐lowering interventions (Vitamin B6 (pyridoxine;… showed no clear difference in adverse events compared with placebo or standard care (high certainty).

1 finding from 1 review

Azoles vs placebo

Adverse events · participants with confirmed toenail onychomycosis

Azole showed no clear difference in adverse events compared with placebo (moderate certainty).

1 finding from 1 review