In July 2010 the European Union (EU) began requiring warning labels on foods that contain any of the color additives tested in the Southampton study.The U.S has expressed concerns to the World Trade Organization that the warning label is not based on adequate scientific evidence. In the U.S, any food containing color additives that FDA certifies for food use, such as FD&C Red No. 40 and FD&C Yellow No. 5 (two of the color additives tested in the Southampton study), must be declared by name as ingredients on the food label.