Try a "Salt Substitute". It's straight Potassium Chloride, and contains no
Sodium or Iodine. The only non-zero ingredient is Potassium - 610 mg per 1/4 oz serving.
Note: the US National Academy of Sciences recently recommended that people consume a lot less Sodium (no more than 1500 mg per day), and a lot more
Potassium (4700 mg per day, nearly twice the previously recommended level).
They've modified the previous recommendations to help reduce the prevalence of high blood pressure. See
http://www.azstarnet.com/dailystar/...ticles/9548.php for more on this.
As far as I can tell, the only good source of potassium supplements is in salt substitutes. Potassium pills are limited to only 99 mg per pill, for reasons I'm not clear on.