Micronutrient evidence brief
Iron supplements are used to correct low iron stores or deficiency. Athletes usually consider them for fatigue or endurance issues, but only when blood work suggests a real need.
Can improve iron status and may help endurance capacity when deficiency is present, especially in higher-risk athletes.
2024 athlete meta-analysis: oral iron raised ferritin and hemoglobin; VO2max benefit depends on low baseline iron.
Use blood work and clinician guidance; iron is not a casual pre-workout ingredient.
Iron-replete users are unlikely to benefit, and excess iron can be harmful. Gastrointestinal side effects are common.
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