Ever had any of the Wrigley's Orbit chewing gum? It's darn good and pretty much different than any other gum out there. If you notice the bold ingredient on the side says "CONTAINS PHENYLALANINE". So I decided to find out what exactly is in that stuff. According to Wikipedia Phenylalanine is an amino acid and comes in either the D- or the L- form. It is used as a sweetener in prepared foods, like soft drinks. "Due to phenylketonuria [a metabolic disorder], products containing aspartame usually have a warning label that they contain phenylalanine, in compliance with U.S. FDA guidelines." This disease only occurs in less than 1 in 15,000 persons. On the positive note cockatoo writes about the sexual enhancing side effects of Phenylalanine, and weight loss aid by suppressing your appetite. So if you don't have PKU go on and enjoy it. It has no side effects and not cancerous according to tracy, Although do watch out for stuff that contains Aspartame. They are a dangerous combo.