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

Banana has 420 mg not 4,200 mg. Supplements usually about 100 mg potassium. Prescription strength is about 750 mg. Too much potassium, especially if you have kidney function decrease can be heart deadly.