Salt
The amount of iodine and the specific iodine compound added to salt varies from country to country. In the United States, the Food and Drug Administration (FDA) recommends [21 CFR 101.9 (c)(8)(iv)] 150 micrograms of iodine per day for both men and women. US iodized salt contains 46–77 ppm (parts per million), whereas in the UK the iodine content of iodized salt is recommended to be 10–22 ppm.
Lugol's iodine
Lugol's is available in various strengths from 1% to slightly less than 13% iodine (wt/v). The most commonly-used 15% solution consists of 5% (wt/v) elemental iodine (I) and 10% (wt/v) potassium iodide (KI) mixed in distilled water, and has a total iodine content of 126.5 mg/mL. The iodide combines with elemental iodine to form a high concentration of potassium triiodide (KI) solution.