Citric acid is the most widely used organic acid in the food industry and has been used for more than 100 years. It is a compound that is found in animals and plants. Citric acid can be produced from different plant sources, including corn. It is also commonly found in citrus fruits such as lemon, orange, and grapefruit, which is why it is named “citric acid”. Citric acid is used in beverages to provide tartness.