kit kat milk chocolate is made for the north american market with the ingredient pgpr (polyglycerol polyricinoleate, e476, aka palsgaard pgpr 4150), which is used to reduce the amount of cocoa butter needed and as an emulsifier. the fda has determined it to be safe for humans in amounts up to 7.5 milligrams per kilogram of body weight. "liver and kidney enlargement was noticed at much higher doses."