When compared ounce for ounce, potato skin has more nutrients that the rest of the potato. Potato skin contains B vitamins, vitamin C, iron, calcium, potassium and other nutrients. Potato skin also provides lots of fiber, about 2 grams per ounce. If you eat a medium baked potato, including the skin, you'll get nearly 4 grams of fiber, 2 milligrams of iron and 926 grams of potassium. Be sure to wash the potato well and remove any obvious blemishes before cooking.