How Iodine Protects Against Radiation
A nuclear or radiological event such as the Fukushima disaster released large amounts of Iodine-131 into the air. In a radioactive event like this, the thyroid will quickly absorb the Iodine-131. This internal contamination damages the thyroid, leading to hypothyroidism (when the thyroid fails to produce adequate hormones) or worse.
That’s because the thyroid cannot distinguish between normal iodine and radioactive iodine. In a situation like this, nascent iodine may save your life.