Potassium Iodide is cheap. I happen to buy 32.5 milligram tablets from Vitacost.com. I take 1/4 tablet twice a week. Monday and Thursday. 240 tablets for about $25. 480 weeks for $25!
Too much iodine is not a good thing. Pay attention to micrograms vs. milligrams. RDA is 150 micrograms. 1050 micrograms per week is RDA. I take 1050 in my daily multivitamin, AND the 1262 micrograms in the potassium iodide each week. Plenty.
77.7% of potassium iodide is iodine.
32.5 milligram tablets contain 2525.3 micrograms of iodide.
1/4 tablet contains 631 micrograms of iodine.
“too much iodine” is subjective. Average dosage in Japan is 50 mg/day. I take 100mg/day. Many people I know take mor than that. You will excrete all excess iodine in the urine. You need much higher doses than the US RDA.