Lemon juice is quite high in vitamin C. There are a lot of health benefits and ways to use lemon juice. Lemons come from a lemon tree, which originated from Asia. Lemon juice is made up of 5% of citric acid. Lemons are used in baking desserts, drinks, teas, and meals as key ingredients quite frequently. Lemon juice contains a good source of fiber and protein as well. I'll show you the health benefits of using lemon juice.