Potassium Iodide vs. Potassium Iodate: Key Differences, Uses & Safety
Potassium Iodide (KI) and Potassium Iodate (KIO₃) are two iodine-containing salts. KI delivers elemental iodine directly; KIO₃ must first be broken down by the body to release iodine.
People confuse them because both come as white pills labeled “iodine” and are stockpiled for nuclear emergencies. Pharmacists call them different names, but headlines just say “take iodine,” so the mix-up sticks.
Key Differences
KI dissolves fast, tastes salty, and is approved by WHO and FDA for thyroid blocking. KIO₃ is more stable in tablets, tastesless, and common in Asia and multivitamins. Shelf-life is similar, but KIO₃ may cause more stomach upset at high doses.
Which One Should You Choose?
If your national emergency kit lists KI, stick to it—regulators have the dosing data. Travelers who find only KIO₃ can use it in equal iodine-content amounts, but check local guidance first. Pregnant women and kids are generally directed toward KI.
Can I crush the tablet for kids?
Yes; dissolve KI in juice or milk, or use pediatric liquid formulations. KIO₃ tablets can also be crushed, but confirm the dose with a pharmacist.
Are iodized salt and these pills the same?
No. Table salt contains micrograms of iodide, far below the 65–130 mg needed for thyroid blocking during radiation exposure.