McDonald's French fries also contain canola oil, soybean oil and hydrogenated soybean oil along with a natural beef flavoring that is made with derivatives from wheat and milk, meaning that McDonald's French fries are not wheat or dairy free. Citric acid, a preservative derived from citric fruit, dextrose (sugar), and a chemical to maintain color called sodium acid pyrophosphate, and salt are also added.
The hydrogenated soybean oil contains TBHQ or tertiary butylhydroquinone, a type of butane that can have side effects such as nausea, vomiting and lowered estrogen levels. To defoam the oil, dimethylpolysiloxane is used. Dimethylpolysiloxane is a defoaming agent made from silicone. A silicon-based polymer, dimethylpolysiloxane is an ingredient in the toy, Silly putty.