Lemon juice is a type of citrus fruit juice that is widely used for its tart and refreshing flavour. Lemons are believed to have originated in Asia, specifically in Northeast India and Myanmar. They were brought to Europe by Arab traders in the 10th century and eventually made their way to the Americas during the colonial era. Today, lemons are widely cultivated in many parts of the world, including the United States, Italy, Spain, and India.  In Ayurvedic medicine, lemon juice is believed to have a cleansing and detoxifying effect on the body. It is often recommended for digestive issues, such as bloating and indigestion, and is also used to treat respiratory problems, such as asthma and coughs.