I see both SSKI and potassium iodide crystals available on eBay Canada. The SSKI has a little less iodide than Trapper's, but it is pre-mixed. Try just the Iodoral first. See how you do. Some people do just fine on it all by itself. I prefer having a drop of SSKI per 25 mg Iodoral, just because that seems to be a good ratio for me not to get too dragged down by Iodoral. But let your body tell you if you need to do this. :)