Malic acid is a dicarboxylic acid made by all living organisms. It is naturally occurring in the organic acid of many fruits, and it is present in human metabolism through the Krebs cycle. Malic acid is used as an acidulant, a food additive that gives foods a tart flavor and adds the sour taste of fruits, especially a citrus taste. DL malic acid is colorless, odorless, and water-soluble, and can exist in crystal or granulated form. Limited volumes of L malic acid are commercially produced.