Who said you have low potassium?
Anyway - eat a banana or two, that will help.
I have low potassium. Checking health food store and vitamin sections of stores, most I find is a pill with 3% daily value (of FDA daily recommendation??). Why? I am sure I am not supposed to eat 33 a day.
Those pills are only a supplement, they are not meant to replace all other sources. Other sources are listed in this link, http://www.healthaliciousness.com/articles/food-sources-of-potassium.php