Do I need my dr's permission to take potassium

I posted this question yesterday, but it didn't make it into the top 10, so I think it got missed. I can't tolerate bananas; but I know I need potassium. I've been getting leg cramps at night and I know that's a sign of a potassium defiency. So, I want to know if I should get myself some potassium pills (i.e., www.vitalady.com), or do I need to wait for blood tests and a visit to my surgeon? If so, I'll have to wait 6 months before I see him again. Thanks for any responses.

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