The new American Academy of Neurology Guidelines released last spring said
"...noteworthy conclusions from the literature review were that there are currently no proven neuroprotective strategies to slow disease progression and that no vitamin or nutritional supplements have any proven role in the treatment of Parkinson's disease. On the other hand, there are some approaches - including exercise programs, physical therapy and speech therapy - that have a useful treatment function."
more info here
http://www.pdf.org/Publications/news...6/up_close.cfm
So ....... exercise seems to have the best KNOWN treatment effect.
BUT - I don't think that supplements, vitamins, "alternative" treatments have been ruled out - just not studied enough or studied appropriately.
If vitamins and supplements make you feel better, move better, then why not take them if not toxic?
Any research that can be done in the area of understanding and preventing cellular death is important.