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Benefits of Selenium (Thyroid)

This content is for informational purposes only and does not constitute medical advice. Consult your healthcare provider before starting any supplement. Full disclaimer

Evidence-Based Benefits

  • Hashimoto's thyroiditis — 200mcg selenomethionine daily reduced TPO antibodies by 21% over 3 months in a landmark RCT (Gartner et al., 2002)
  • T4 to T3 conversion — selenium is a cofactor for type 1, 2, and 3 deiodinase enzymes essential for thyroid hormone activation
  • Thyroid protection — glutathione peroxidase (a selenoprotein) neutralizes hydrogen peroxide generated during thyroid hormone synthesis
  • Graves' disease — selenium supplementation improved quality of life and slowed progression of mild Graves' orbitopathy (Marcocci et al., 2011, NEJM)
  • Postpartum thyroiditis — 200mcg daily during and after pregnancy reduced postpartum thyroid dysfunction rates (Negro et al., 2007)

What the Research Says

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.

Related Conditions

Thyroid Disorders
Full Selenium (Thyroid) Guide

References

  1. (). Selenium supplementation in patients with autoimmune thyroiditis decreases thyroid peroxidase antibodies concentrations. Journal of Clinical Endocrinology & Metabolism. DOI
  2. (). Selenium and the course of mild Graves' orbitopathy. New England Journal of Medicine. DOI
  3. (). The influence of selenium supplementation on postpartum thyroid status in pregnant women with thyroid peroxidase autoantibodies. Journal of Clinical Endocrinology & Metabolism. DOI