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Evidence found and GRADE certainty

8 questions · 8 findings · 4 reviews · Headline outcomes only

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No studies found 6 · 75%GRADE not reported 0 · 0%Very low 0 · 0%Low 1 · 12.5%Moderate 1 · 12.5%High 0 · 0%

Vitamin E + vitamin C vs placebo

Any adverse effects of vitamin supplementation sufficient to stop supplementation · pregnant women

Vitamin C and vitamin E showed no clear difference in any adverse effects of vitamin supplementation sufficient to stop… compared with placebo (moderate certainty).

1 finding from 1 review

Provision of maize flour or maize flour products fortified with iron plus other vitamins and minerals vs unfortified maize flours or maize flour products

Any adverse effects (including constipation, nausea, vomiting, heartburn or diarrhoea, as measured by trialists) · general population older than 2 years of age (including pregnant women), in Kenya and Mexico

The review found no eligible studies for this question.

1 finding from 1 review

Rice fortified with iron alone or in combination with other micronutrients vs unfortified rice (no micronutrients added)

Any adverse effects (hookworm infection risk) · general population of all age groups (including pregnant women) from any country, over two years of age

Rice fortified with iron alone or in combination with other… may leads to higher any adverse effects (hookworm infection risk) compared with unfortified rice (no micronutrients added) (low certainty).

1 finding from 1 review