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Mineral

Potassium Iodide

Potassium iodide is a salt of potassium and iodine, used as a source of iodine in supplements and iodized salt.

Organ FunctionEssential HealthHair & SkinImmune Support

What it is studied for

The strongest rated effects first. Bars show the size of the effect, the letter grades the evidence, and each rating lists the studies behind it.

Thyroid HealthOrgan FunctionStrongA3 studies
Essential HealthStrongA3 studies
Skin textureHair & SkinSmallCNo linked study
Immune SupportSmallCNo linked study
Every rating with its studiesGrouped by health goal, with the publications behind each rating

What does potassium iodide provide?

Potassium iodide is a source of iodine, which the thyroid uses to make its hormones. It appears in dietary supplements, but its medical uses involve a different purpose and dose. 1

Why is it used in radiation emergencies?

A large dose of stable iodine can block the thyroid from taking up radioactive iodine. This protects the thyroid specifically: potassium iodide does not shield the rest of the body or protect against other radioactive substances. CDC guidance reserves it for situations in which public-health officials advise its use. 2

Key studies

The most recent publications linked to Potassium Iodide's ratings.

Graves’ hyperthyroidism treated with potassium iodide: early response and after 2 years of follow-up2024Potassium – a scoping review for Nordic Nutrition Recommendations 20232024Iodide-sensitive Graves' hyperthyroidism and the strategy for resistant or escaped patients during potassium iodide treatment.2022Effects of Preoperative Iodine Administration on Thyroidectomy for Hyperthyroidism: A Systematic Review and Meta-analysis2019Effect of increased potassium intake on cardiovascular risk factors and disease: systematic review and meta-analyses2013
All 6 studiesEvery publication linked to Potassium Iodide

Why people take it

Essential Health26.3%
Energy18.4%
Detox14.5%
Immune Support14.5%
Organ Function11.8%
Cognition5.3%

SuppCo community snapshot, 2026-09-28. Reasons for use are not evidence that it works.

Questions people ask

Can iodized salt replace an emergency tablet?

No. CDC says iodized salt and iodine-containing foods do not provide the protection of emergency potassium iodide. Timing and official instructions matter. 2

Should emergency iodine be taken just in case?

CDC advises using it only when public-health officials recommend it. It is not general protection against radiation. 2

Does the adult upper limit mean a target intake?

No. The EU figure of 600 μg concerns the upper boundary of long-term total intake; it is not the daily requirement. 3

Can iodine be used during pregnancy?

DGE distinguishes total iodine needs from supplementation and recommends medical discussion. Emergency iodine follows separate official guidance and medical monitoring. 4 5

Does the surgery evidence show no possible benefit?

The newer meta-analysis found no clear improvement in the measured surgical outcomes. Uncertainty remains, and the authors recommend larger randomized trials. 6

Sources