For those looking for for food grade potassium iodide:

We use Tri-Quench which you can purchase from Jonathan Wright's web site.  This 
is rated as a dietary supplement.  

http://www.tahoma-clinic.com/shop/product_info.php/products_id/1423?osCsid=e0e378eb4ca91225

To read his recommendations on use, check this:

http://www.tahoma-clinic.com/iodide.shtml

Hope this helps.

Del