For starters, here s what potassium iodide actually is and what it could do in the event of a nuclear emergency. The supplement is a salt of stable iodine that can help block radioactive iodine from being absorbed by the thyroid gland and protect it from radiation injury, the Centers for Disease Control and .Back when the White House was focused on conjuring images of mushroom clouds to sell the Iraq war, it called potassium iodide pills crucial to preventing thyroid cancer. But now that it s looking like we might actually need all those nuclear reactors plus a whole lot more of them to power the country, the .People anxious about a North Korean or nuclear explosion are buying up potassium iodide pills, but the supplement has an extremely limited use. People are stockpiling special pills to guard against radioactive fallout but here s what you actually need in a nuclear survival kit. Erin Brodwin and .Here are steps you can take in the event of a nuclear strike. The alerts were quickly withdrawn, but widespread curiosity about how to increase the odds of surviving a nuclear remains. Get The Orders have been flooding in for potassium iodide pills, fine particulate face masks and radiation wipes..