Apple Vitamins

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.

Potassium Information

Potassium is essential for the body's growth and maintenance. It is necessary to keep a normal water balance between the cells and body fluids.

Potassium plays an essential role in proper heart function. 

Deficiency may cause muscular cramps, twitching and weakness, irregular heartbeat, insomnia, kidney and lung failure.

Fruit Sources:

Avocado 
Bananas 
Blackcurrants 
Breadfruit 
Cherimoya 
Cherries 
Chinesepear 
Dates 
Grapefruit 
Guava 
Kiwi 
Lychee 
Papaya 
Passionfruit 
Pomegranate 
Pricklypear 
Watermelon

Nut/Grain Sources:

Almonds 
Buckwheat 
Chestnuts 
Coconut 
Oats 
Pistachios 
Pumpkin Seeds 
Rye 
Sunflower Seeds 
Wheat - Durum 
Wheat - Hard Red 
Wheat - Hard White

Meat/Protein Sources:

Beef 
Cows Milk 
Catfish 
Herring 
Perch 
Pollock 
Salmon 
Sardines 
Tuna 
Goat Milk 
Pork 
Soy Beans 
Turkey Bacon 
Veal 
Yogurt 
Lowfat Yogurt 
Pork Sausage 
Ground Chicken

Legume Sources:

Most legumes are a great source of Potassium but these are the highest. 
Adzuki Beans 
Edamame 
Kidney Beans 
Lima Beans 
Pinto Beans 
Soy Beans 
White Beans

Vegetable Sources:

Amaranth leaves 
Bamboo Shoots 
Bok Choy 
Butternut squash 
French Beans 
Lima Beans 
Parsnips 
Potatoes 
Pumpkin 
Spirulina 
Sweet Potatoes 
Swiss Chard