I heard about Iodine a long time before I started taking it myself. I thought that the kelp tablets i regularly took were probably enough. And I'm sure I was more Iodine sufficient than most people (I also ate other foods containing iodine, like garlic). Later i went to 12.5 mg Iodoral for some months and then in April I bought Lugol's from Trapper along with a supply of Iodoral. I mostly take the liquid, will probably give away some of the Iodoral to friends.