Since I am not at home, I will pull this out of my RAM.

I have 2 bottles at home. This has a long shelf life when stored properly, at room temperature away from sunlight.

These provide thyroid protection, primarily in children, from radiation effects.

There is some great info on KI t be found at: http://www.standeyo.com
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QMC, USCG (Ret)
The best luck is what you make yourself!