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Selenium (Thyroid) Research & Evidence

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This content is for informational purposes only and does not constitute medical advice. Statements about dietary supplements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease. Individual results may vary — consult your healthcare provider before starting any supplement. Full disclaimer

Evidence Level

Strong

Selenium has one of the strongest evidence bases among minerals for thyroid support. The landmark Gartner et al. (2002) RCT demonstrated a 21% reduction in TPO antibodies with 200mcg selenomethionine daily in Hashimoto's patients. The EUGOGO trial (Marcocci et al., 2011, NEJM) showed selenium improved outcomes in mild Graves' orbitopathy. Negro et al. (2007) demonstrated reduced postpartum thyroiditis in TPO-antibody-positive pregnant women. A 2010 Cochrane review acknowledged the evidence but called for larger, longer trials to confirm clinical endpoints beyond antibody reduction.

Evidence by Condition

ConditionStudied DoseEvidence
Hashimoto's thyroiditis200mcg selenomethionine dailyStrong
General thyroid support100-200mcg dailyStrong
Graves' orbitopathy200mcg daily (100mcg twice daily)Strong
Postpartum thyroiditis prevention200mcg dailyModerate
Full Selenium (Thyroid) Guide

References

  1. RCTGärtner R, Gasnier BC, Dietrich JW, Krebs B, Angstwurm MW (2002). Selenium supplementation in patients with autoimmune thyroiditis decreases thyroid peroxidase antibodies concentrations. Journal of Clinical Endocrinology & Metabolism. DOI PubMed
  2. RCTMarcocci C, Kahaly GJ, Krassas GE, Bartalena L, Prummel M, Stahl M, Altea MA, Nardi M, Pitz S, Boboridis K, Sivelli P, von Arx G, Mourits MP, Baldeschi L, Bencivelli W, Wiersinga W (2011). Selenium and the course of mild Graves' orbitopathy. New England Journal of Medicine. DOI PubMed
  3. RCTNegro R, Greco G, Mangieri T, Pezzarossa A, Dazzi D, Hassan H (2007). The influence of selenium supplementation on postpartum thyroid status in pregnant women with thyroid peroxidase autoantibodies. Journal of Clinical Endocrinology & Metabolism. DOI PubMed