Potassium is an electrolyte mineral commonly lost through sweat during long bouts of exercise. It is needed for heart function, muscle contractions and bone strength. Corn has a moderate amount of potassium. A 1 cup serving contains 325 milligrams. The total recommended intake is 4,700 milligrams for adults over 19 years old. Pairing sweet corn with beans, potatoes or spinach will boost the potassium content.