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Iron supplementation reduces restless legs syndrome severity and sleep disturbances in individuals with iron deficiency anemia

Iron deficiency anemia is consistently linked to decreased sleep quality, reduced sleep duration, and increased restless legs syndrome (RLS). Iron supplementation, whether oral or intravenous, significantly decreases RLS severity scores and sleep disturbances in most assessed randomized controlled trials, with moderate-certainty evidence.

Last updated: Jul 14, 2026•1 RCTs•📖 Read as article →

Evidence Score

Evidence Score42/100
Human RCT★★☆☆☆
Meta-analysis☆☆☆☆☆
Mechanism★★★★★
Safety★★★★☆
Confidencelow

Study Evidence

Study 1. Anemia and Sleep Disturbances: Mechanisms, Evidence and Clinical Implications - a Narrative Review.

observational

Umesh M, Singaravelu V, Medala K, Ganji V, Gaur A · Maedica (2026)

Participants: N/A
Duration: N/A
Intervention: Iron supplementation (oral or intravenous)
Outcome: RLS severity scores, sleep disturbances
Effect Size: N/A
Population: Individuals with iron deficiency anemia (IDA) across different age groups and populations

Result:

PubMed: 42416773DOI: 10.26574/maedica.2026.21.2.524

Mechanism Graph

Iron deficiency leads to low ferritin levels (50-75 µg/L identified as clinically pertinent)
↓
Low iron impairs dopamine synthesis and function in the brain
↓
Dopaminergic dysfunction contributes to RLS and sleep disruption
↓
Iron repletion restores dopamine function, reducing RLS severity and improving sleep

Limitations

  • ⚠Significant variation among studies regarding anemia definitions, sleep assessment methodologies, and population characteristics
  • ⚠Narrative synthesis due to heterogeneity, limiting quantitative meta-analysis

Frequently Asked Questions

What is the most common sleep disorder linked to iron deficiency anemia?▼

Restless legs syndrome (RLS) is the most typical and iron-responsive symptom associated with iron deficiency anemia.

What ferritin levels are considered clinically relevant for RLS in IDA?▼

Ferritin levels of 50-75 µg/L are identified as clinically pertinent indicators for RLS in individuals with iron deficiency anemia.

Does iron supplementation improve sleep quality in IDA patients?▼

Yes, iron supplementation (oral or intravenous) significantly decreases RLS severity scores and sleep disturbances in most assessed randomized controlled trials.

What sleep outcomes are affected by iron deficiency anemia?▼

Iron deficiency anemia is linked to decreased sleep quality (higher PSQI scores), reduced total sleep duration, extended sleep-onset latency, lower sleep efficiency, and decreased slow-wave sleep.

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References

  1. 1.Umesh M, Singaravelu V, Medala K, Ganji V, Gaur A. "Anemia and Sleep Disturbances: Mechanisms, Evidence and Clinical Implications - a Narrative Review.." Maedica, 2026. PMID: 42416773 DOI: 10.26574/maedica.2026.21.2.524
Disclaimer: This content is for educational purposes only and is not medical advice. Evidence scores reflect the quality and quantity of available research, not clinical recommendations. Always consult a healthcare professional before starting any supplement or intervention.