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What do systematic reviews say?

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Evidence found and GRADE certainty

8 questions · 8 findings · 8 reviews · Headline outcomes only

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No studies found 4 · 50%GRADE not reported 1 · 12.5%Very low 3 · 37.5%Low 0 · 0%Moderate 0 · 0%High 0 · 0%

Summary of findings table ‐ Protein, arginine, zinc and antioxidants vs standard diet or placebo

Gastrointestinal adverse events · residents of long‐term care (≥ 65 years) with pressure ulcers; inpatients with pressure ulcers

It is very uncertain whether summary of findings table ‐ Protein, arginine, zinc and antioxidants changes side effects: at least one adverse gastrointestinal event compared with standard diet or placebo (very low certainty).

1 finding from 1 review

Dietary supplements vs placebo

Zinc sulphate versus placebo Adverse effects · women with moderate or severe primary dysmenorrhoea

It is very uncertain whether dietary supplements changes zinc sulphate versus placebo Adverse effects compared with placebo (very low certainty).

1 finding from 1 review

Intervention not reported

Adverse effects of treatment · adults over 18 years with tinnitus

The review found no eligible studies for this question.

1 finding from 1 review