Nutritional Benefits of Potatoes Not only are potatoes delicious, they’re also an excellent source of vitamin C, potassium, and B6, especially when the skin is left on and eaten. One medium potato, including the skin, contains approximately 30 percent of your daily recommendation of these three nutrients. Vitamin C acts as an antioxidant to reduce inflammation and prevent cell damage. Vitamin C also aids in collagen production, which helps maintain healthy gums and helps to heal wounds. Potatoes are also one of the best sources of potassium—one medium potato contains more potassium per serving