iOSAT delivers 130 mg. potassium iodide per tablet to fill your thyroid uptake of iodine so that you don't absorb dangerous radiation. 14 tablets per package- enough for 1 person for 14 days. Product description: Iosat Potassium Iodide has been FDA approved since 1982. Radioactive iodine can travel hundreds of miles downwind, such as it did after the Chernobyl and Fukushima disasters. The thyroid is the only part of the body that absorbs and stores iodine. By taking FDA approved potassium iodide prior to exposure of radioactive iodine, your thyroid will become saturated with safe, stable iodine. This will prevent your thyroid's absorption of any additional iodine (radioactive or not) long enough for the radioactive iodine inhaled or ingested to be safely dispersed through the kidneys.