its not the % of elemental that counts, its the total amount of Iodine per day that does the trick. best and cheapest way to do that - buy SSKI 2% from me. the button to order SSKI is at the top of the page. order 2 and you get a free magnascent. that way you can have all three types that i recommend. all thats needed then is the companion nutrients, especially selenium. dont forget the selenomethinine.