Hi Pat, I was told Estrogen and PD or Estrogen and Dopamine were big subjects at the recent Neurology meeting in San Francisco. I was also informed that there is a research study at NIH that is in need of subjects for such a study. I haven't tried it yet, but an address similar to this should get you on the WWW at NIH. (httn://www.nih.gov). Then just work your way down until you find what you are looking for. I believe the researcher is a neurologist named Dr. John Fahn(sp). Regards, Alan