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What do systematic reviews say?

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Evidence found and GRADE certainty

2,973 questions · 3,072 findings · 410 reviews · Headline outcomes only

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No studies found 559 · 18.2%GRADE not reported 143 · 4.7%Very low 654 · 21.3%Low 833 · 27.1%Moderate 683 · 22.2%High 200 · 6.5%

Foods fortified with zinc alone vs same foods without adding zinc

Stunting · general population of all age groups (including pregnant women) from any country, over two years of age

Foods fortified with zinc alone showed no clear difference in stunting (author defined) compared with same foods without adding zinc (low certainty).

1 finding from 1 review

Foods fortified with zinc alone vs same foods without adding zinc

Underweight · general population of all age groups (including pregnant women) from any country, over two years of age

Foods fortified with zinc alone showed no clear difference in underweight (author defined) compared with same foods without adding zinc (low certainty).

1 finding from 1 review

Foods fortified with zinc plus other micronutrients vs foods fortified with other micronutrients without zinc

Zinc deficiency (as defined by authors, depending on age and gender) · general population of all age groups (including pregnant women) from any country, over two years of age

It is very uncertain whether foods fortified with zinc plus other micronutrients changes zinc deficiency (as defined by authors, depending on age and gender) compared with foods fortified with other micronutrients without zinc (very low certainty).

1 finding from 1 review

Intervention not reported

Change in Exercise Capacity (6MWD) · Adults (>18 years) with pulmonary hypertension of varied aetiology (PAH, CTEPH and left heart disease)
1 finding from 1 review