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.
Lemons are a rich source of vitamin C
Lemon juice is used to make lemonade, soft drinks, and cocktails.
Lemon juice is also used as a short-term preservative on certain foods that tend to oxidize and turn brown after being sliced (enzymatic browning), such as apples, bananas, and avocados, where its acid denatures the enzymes.