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What do systematic reviews say?

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Evidence found and GRADE certainty

3 questions · 3 findings · 2 reviews · Developmental, Psychosocial and Learning Problems

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No studies found 0 · 0%GRADE not reported 0 · 0%Very low 0 · 0%Low 2 · 66.7%Moderate 1 · 33.3%High 0 · 0%

Intermittent use of iron supplements vs any daily iron supplementation

Side effects or other adverse events · adolescent and adult menstruating women

Intermittent iron supplementation may leads to lower any adverse side effects compared with daily iron supplementation (low certainty).

1 finding from 1 review

Intermittent iron supplementation (alone or with any other micronutrients) vs no supplementation or placebo

Side effects or other adverse events · adolescent and adult menstruating women

Intermittent iron supplementation (alone or with any other… showed no clear difference in any adverse side effects compared with no supplementation or placebo (moderate certainty).

1 finding from 1 review

Intervention not reported

Any adverse side effects (total), as defined and reported by trial authors · menstruating women (non‐pregnant women of reproductive age)

The intervention showed no clear difference in any adverse side effects (total), as defined and reported by trial… (low certainty).

1 finding from 1 review