Assertion: potato's skin | /r/MadeOf | 920 milligrams of potassium
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text: U.S. Potato Board]. The skin of a medium potato contains 920 milligrams of potassium and 3.6 grams of fiber, while the flesh (without the skin) still offers 676 milligrams of potassium (more than a banana) and 2.6 grams of fiber [source: Flipse]. Not too bad, right?