GM1 ganglioside
http://en.wikiversity.org/wiki/PD_Neuroprotection/GM1

So if I am right they knew about this in 1995. In 2005-2006 they started clinical trials on 26 patients, for a period of 5 years. People had less symptoms after 5 years than at the beginning of the trial. So why the hell aren't people getting treated with this ? Why do I find on the website MJFox foundation that they are still doing preclinical tests on this ? Really ... can someone explain this to me ?

And how can something that was discovered in 1995 still not have been completely determined as neuroprotective or not ?