Denatonium is the bitterest compound that has ever discovered. It’s usually called Denatonium Benzoate or Bitrex. The salts of denatonium are usually colorless and odorless solids. It is sold under the trade name of Bitrex®. The taste is so strong, however, that most people cannot tolerate a concentration of more than 30 parts per million of denatonium benzoate.