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.
Iodophor
The optimum concentration is >200 mg/l free iodine with a contact time of 2 minutes and 100 mg/l free iodine for cleaned and dried equipment. In a nonfood-contact application the concentration may rise to 500 – 800 mg/l.