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Iodine / Selenium

Evidence: ★★★★☆ · Status: OTC Supplement

💡 Did you know? Adding iodine to table salt in the 1920s quietly erased goiter and a common cause of intellectual disability — one of history's cheapest health wins.

In plain English

Your thyroid (the body's metabolic thermostat) is built from iodine and switched on by selenium. Deficiency slows your whole metabolism.

How it works

Iodine is the substrate for thyroid hormones T3/T4; selenium (via GPX and deiodinase DIO1/2) converts T4→active T3 and protects the thyroid.

Molecular target & official sources

DIO2 deiodinase (NCBI Gene) · Iodine (PubChem CID 807)

Bottom line

Foundational thyroid pair; don't megadose iodine.

Helps with: Hormones & Testosterone

Availability & where to buy

Available over the counter. Widely available OTC — e.g. iHerb (ships worldwide); in Singapore also Guardian, Watsons, GNC, Shopee / Lazada. Look for a third-party-tested / GMP mark and check the dose per serving.

Used in these protocols

Thyroid Slowdown

Common questions

Does Iodine / Selenium actually work?

Human-evidence rating: 4 of 5. Foundational thyroid pair; don't megadose iodine.

Is Iodine / Selenium legal or approved?

Regulatory status: OTC Supplement.