Apple Nutrition One medium apple with skin contains 0.47 grams of protein, 95 calories, and 4.4 grams of dietary fiber. Minerals: Potassium - 195 mg Calcium - 11 mg Phosphorus - 20 mg Magnesium - 9 mg Manganese - 0.064 mg Iron - 0.22 mg Sodium - 2 mg Copper - 0.049 mg Zinc - 0.07 mg Also contains a trace amount of other minerals. Vitamins: Vitamin A - 98 IU Vitamin B1 (thiamine) - 0.031 mg Vitamin B2 (riboflavin) - 0.047 mg Niacin - 0.166 mg Folate - 5 mcg Pantothenic Acid - 0.111 mg Vitamin B6 - 0.075 mg Vitamin C - 8.4 mg Vitamin E - 0.33 mg Vitamin K - 4 mcg Contains some other vitamins in small amounts.