Evidence Level
Iron is an essential nutrient that addresses iron deficiency and its associated conditions. Vaucher et al. (2012) demonstrated that iron supplementation significantly reduced fatigue in non-anemic but iron-deficient women, highlighting its importance in improving quality of life. Emerging research has explored alternate dosing strategies; Stoffel et al. (2017) found that giving iron every other day improved fractional absorption by 40% compared to consecutive-day dosing, attributed to hepcidin-mediated regulation.
Recent studies have expanded the understanding of iron's role in various populations and conditions. Anker et al. (2025) conducted a systematic review and meta-analysis of six trials involving 7,175 patients, showing that intravenous iron reduced the composite endpoint of heart failure hospitalizations and cardiovascular mortality by 28% compared to placebo. Additionally, Rehman et al. (2025) reviewed 28 studies involving 8,829 children and adolescents, concluding that low-dose iron supplementation (<5 mg/kg/day) for specific durations optimally improves hemoglobin levels in cases of iron deficiency anemia.
Iron's impact extends beyond physical symptoms to cognitive and psychiatric outcomes. Fiani et al. (2025) analyzed 18 studies involving 1,408 participants, finding that iron supplementation improved anxiety, fatigue, cognitive intelligence, and short-term memory in non-anemic children, adolescents, and menstruating adults with iron deficiency. Furthermore, Garofalo et al. (2023) linked iron deficiency to altered thyroid function, particularly in pregnant women, emphasizing the broader health implications of adequate iron levels.
These findings underscore the multifaceted benefits of iron supplementation across diverse populations and conditions, supported by robust evidence from multiple studies.