I have found only references to Potassium Iodide and SSKI. It has been far too long since general chemistry for me to offer a meaningful opinion about the difference. <br>However, since I have in my possession two bottles of potassium IODIDE, I know that it is available. SSKI (supersaturated sollution of potassium iodided) and potassium iodide pills are the only form thats I personally have seen recommended for loading following a nuclear event. <br>Hope this helps.