Also known as: potassium iodide, iodoral, kelp iodine, jod
Latest evidence update: 2026-03-27
Strongest in Sample size (79). Held back by Recency (22).
Solid mix of RCTs with some methodological gaps.
Confirmed across many independent studies with significant findings.
Tens of thousands of participants pooled across studies.
Mostly aligned, with some divergence.
Mostly pre-2020 research; updates may be needed.
Effect-size tagged on 375 of 400 claims for this supplement. Our research updates daily; remaining claims are pending re-processing.
Areas where research points to a consistent direction of effect. The strength of evidence is graded; the size of the effect is not quantified.
Recommended: 150-300mcg daily
ProtocolEngine provides general health information based on published research. This is not medical advice. Consult a healthcare professional before starting any supplement or health protocol.
Supports healthy child brain development, with deficiency linked to 7-10 point reductions in IQ and supplementation showing moderate positive effects on mental development
Reduces thyroid enlargement and improves thyroid function markers in pregnant women with mild-to-moderate iodine deficiency
Reduces postpartum hyperthyroidism risk by approximately 68 percent compared to no supplementation
Does not significantly improve cognitive, language, or motor development in children born prematurely or in mildly iodine-deficient populations
May improve response time and motor development in children with poor motor skills living in iodine-deficient areas, though results are mixed