why are potassium supplements so low for safety reasons but a banana has like 4200mg?

Question

Edit: i confused numbers. Google says a medium banana has 422mg but the recommended amount is anywhere between 2000mg and 4700mg

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Answer 1

A banana has only about a 10th of what you wrote, 450mg of potassium each. That also seems to be roughly the content of one supplement pill. So the answer is: they are not that low.