Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

1,281 questions · 1,361 findings · 120 reviews · Developmental, Psychosocial and Learning Problems

No studies found 286 · 21%GRADE not reported 61 · 4.5%Very low 381 · 28%Low 381 · 28%Moderate 228 · 16.8%High 24 · 1.8%

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

Iron deficiency anaemia · adolescent and adult menstruating women

Intermittent iron supplementation (alone or with any other… showed no clear difference in iron deficiency anaemia (as defined by the presence of anaemia plus… compared with no supplementation or placebo (low certainty).

1 finding from 1 review

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

All‐cause morbidity · adolescent and adult menstruating women

Intermittent iron supplementation (alone or with any other… showed no clear difference in all‐cause morbidity (the most frequent event associated with the… compared with no supplementation or placebo (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

Intermittent use of iron supplements vs any daily iron supplementation

Anaemia · adolescent and adult menstruating women

Intermittent iron supplementation showed no clear difference in anaemia (haemoglobin concentration below a cut‐off defined by the… compared with daily iron supplementation (moderate certainty).

1 finding from 1 review