About Iodine
Critical building block for thyroid hormones T3 and T4, which regulate metabolism, growth, and development. Kelp-based supplements can provide highly variable iodine content—standardized potassium iodide is more reliable for consistent dosing. Both deficiency and excess can disrupt thyroid function, so supplementation should be targeted. Pregnant and breastfeeding women need 220–290 mcg/day. Populations relying on non-iodized salt are at highest risk of deficiency.
What Iodine supports
- Powers thyroid function
- Supports brain development
- Regulates metabolism
How much Iodine to take
Clinical studies typically use 150–500 mcg of Iodine. Common kelp and iodine supplement range.
- RDA
- 150 mcg
- Upper limit (UL)
- 1100 mcg
- Effective range
- 150–500 mcg
Forms of Iodine compared
- Potassium iodidePremiumPharmaceutical-grade iodine; precise dosing and proven efficacy.
- Kelp (whole-food)StandardWhole-food iodine — content varies wildly (200 mcg to 5+ mg per serving).
Clinical evidence
Strong clinical evidence. Essential for thyroid hormone synthesis; WHO estimates 2 billion people worldwide have insufficient intake
NIH Fact Sheet