I would just like to add to this topic, that there are natural sources of dopamine, and that is fava beans. Ayurvedic medicine uses them in the treatment of pd. A while back, the fairly new government agency, OAM -Office of Alternative Medicine, had granted the University of Illinois to research into this. Last I heard, and that was probably a year or more ago, there were into the animals studies portion. By now, I'm sure they're conducting human trials. Just like the "artificial" L-dopa which we alll take, however, this natural source doesn't represent a "cure", but rather another way to treat the symptoms. Perhaps, being naturally derived, it might ultimately be more effective and safer, but it isn't a cure. Does anyone know of recent status on this research? Wendy Tebay