"Brominated vegetable oil is patented as a flame retardant and it's banned in food all over Europe and Japan, but it's on the ingredient list of about 10 percent of sodas in the U.S. It's not in Coca-Cola, but is in Mountain Dew, Fanta Orange, and in some flavors of Powerade and Gatorade.
What brominated vegetable oil (BVO) does to soda is, Coca-Cola explains, 'prevent the citrus flavoring oils from floating to the surface in beverages.' The fruit flavors that are mixed into a drink would otherwise settle out. What BVO does when it's acting as a flame retardant is not much different: It slows down the chemical reactions that cause a fire."