When life throws you a lemon, use it in a variety of ways! The possibilities are beyond just cooking and baking. Use it to make drinks, to marinate, as a cleaning agent, and in medicines. Lemon trees produce fruit all year round so you will never run out. Lemons contain vitamin C, citric acid, flavonoids, B-complex vitamins, calcium, copper, iron, magnesium, phosphorus, potassium, and fiber. Lemons contain more potassium than apples or grapes; potassium is beneficial to the heart.