How to Store Potassium Iodide for Maximum Shelf Life

Proper storage ensures your KI tablets remain effective for their full shelf life — and likely well beyond. Potassium iodide is inherently stable, but environmental factors can accelerate degradation.

Optimal Conditions

• Temperature: 59–86°F (15–30°C) — standard room temperature
• Humidity: Low — avoid moisture-prone areas
• Light: Protect from direct sunlight and UV exposure
• Packaging: Keep in original sealed packaging until needed

Best Storage Locations

• ✅ Bedroom closet (dark, dry, stable temperature)
• ✅ Dedicated emergency supplies shelf
• ✅ Nightstand drawer (for quick access)
• ❌ Bathroom (humidity from showers)
• ❌ Garage (temperature extremes)
• ❌ Vehicle glove compartment long-term (heat cycles) — OK for iOSAT travel pack short-term
• ❌ Kitchen near stove (heat and humidity)

Know When to Replace

Signs of potential degradation: visible yellowing or discoloration, moisture or condensation inside packaging, tablets crumbling or powdering, tablet fails to dissolve in water within 5 minutes. Even potentially degraded tablets may still be effective — crush and dissolve rather than discarding.

Rotation Strategy

Mark your purchase date on the packaging. Set a calendar reminder 6 months before expiration to reorder. Donate or use old stock for awareness training. New stock should have the latest expiration date available.