How many mg of potassium are in a banana?

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A medium banana has about 422 mg of potassium

http://www.extension.iastate.edu/wayne/news/potassium.htm

A banana is a pretty good source of potassium. However it is not sensational. It has about the same potassium content per calorie as a potato. See http://members.tripod.com/~charles_W/table3.html

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