FD&C RED 40 BAD STUFF! Red 40 may cause symptoms of hypersensitivity in some people, including swelling around the mouth, and it may also cause hives. The colorant might contain contaminants that may contribute to cancer in humans and could trigger hyperactivity in children. In a handful of studies, Red 40 damaged the DNA of mice, according to the CSPI.
Red Dye #40 is a highly refined petrochemical and based on potential ill-effects including headaches/migraines, hyperactivity, decreased concentration, sleep disturbances and a feeling of “crawling out of one’s skin”, its use in foods has been reduced or banned from use in other countries.