Spinach, banana, and dates are good sources of vitamin K which plays an essential role in wound healing. A cup of dates contains 1,168 milligrams of potassium. Per 100 grams of bananas contain 358 milligrams of potassium and per 100 grams of spinach has 558 micrograms of potassium. Dates have 10 IU of vitamin A in per 100 grams. Bananas and spinach both contain beta-carotene which converts into vitamin A inside the body that helps to maintain the immune system and enhances your eyesight.