👉 The term "benzidine" refers to a substance that is used in the production of an enzyme called benzoic acid. Benzoic acid is a compound found in the body and in some plants, it can be converted into a chemical reaction called benzoic acid synthase. Benzoic acid is important for several functions in the human body. It plays a crucial role in metabolism, where it helps to break down fats and proteins into energy that can be used by the body.