Nutrients in orange fruit are plentiful and diverse. Orange is low in calories, and contains no saturated fats or cholesterol, but is rich in vital antioxidants, vitamins, and dietary fiber. Calories- 49, Vitamin-C- 48.5 mg, Vitamin A- 230 IU, Protein- 0.94 g, Potassium-179 mg in 100 g of fresh fruit.