Ammonium Sulfate
This chemical is an inorganic salt most often used in the baking industry. Ammonium sulfate is commonly used as a dough conditioner, surfactant, or dough strengthener; bread companies use the substance to improve the volume and shelf life of their bread.
According to one case study in the National Library of Medicine Database, excessive consumption of the chemical may cause major short-term gastrointestinal distress.