Iron
Evidence by outcome
energy / fatiguegrade Ahigh certainty— reliably reduces fatigue when iron deficiency / IDA is present; no benefit when iron-replete
cognitiongrade Clow certainty— improves attention/cognition when iron deficiency is present; no benefit if replete
People say · Evidence shows
“everyone feels more energetic on iron”
matchesnegligiblefolk
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More
sources: PMID:10000007 · PMID:20000115