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Benefits of Iodine (Thyroid)

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Evidence-Based Benefits

  • Thyroid function — iodine is a structural component of T3 and T4; supplementation corrects hypothyroidism caused by deficiency (WHO/UNICEF/ICCIDD global evidence)
  • Goiter prevention — universal salt iodization programs reduced global goiter prevalence by over 50% (Zimmermann et al., 2008)
  • Pregnancy outcomes — adequate iodine prevents cretinism and supports fetal neurodevelopment; 150-250mcg daily recommended by WHO during pregnancy
  • Cognitive development — iodine supplementation in deficient populations improved child IQ by 8-13 points in meta-analyses

What the Research Says

Iodine's role in thyroid function is among the most well-established in nutrition science. The WHO estimates that 2 billion people worldwide have insufficient iodine intake. Universal salt iodization remains one of the most successful public health interventions globally. Zimmermann's 2009 Endocrine Reviews paper provides a comprehensive overview demonstrating that iodine deficiency is fully preventable with adequate intake. However, excess iodine (>1,100mcg daily) can paradoxically cause thyroid dysfunction, particularly in those with pre-existing autoimmune thyroid disease (Hashimoto's).

Related Conditions

Thyroid Disorders
Full Iodine (Thyroid) Guide

References

  1. (). Iodine deficiency. Endocrine Reviews. DOI
  2. (). Iodine-deficiency disorders. The Lancet. DOI