I don't understand why your doctor told you to stay away from iodine?
Salt is an effective vehicle for distributing Iodine to the public because it does not spoil and is consumed in more predictable amounts than most other commodities.[citation needed] For example, the concentration of Iodine in salt has gradually increased in Switzerland: 3.75 mg/kg in 1952, 7.5 mg/kg in 1962, 15 mg/kg in 1980, 20 mg/kg in 1998, and 25 mg/kg in 2014.[5] These increases were found to improve Iodine status in the general Swiss population