I have read of a few cases where chelation therapy has improved PD symptoms and produced a better response to medication by increasing blood flow to the brain. Apparantly its ability to reduce arteriosclerosis in all of the circulatory system is the mechanism of action. Also, if there is any toxicity due to mercury which is affecting the nervous system, chelation can be very beneficial as well. The whole mercury debate regarding mercory amalgum fillings is a very interesting one. The fact that dentists have to treat the fillings as hazardous waste when they are removed from your mouth makes one wonder why they were ever placed there in the first place. Anyway, if you are diagnosed with severe arteriosclerosis and have PD, there is a possibility that chelation could be beneficial. Done properly and followed with a high fiber, low fat, very nutritious diet it is quiet beneficial, but again get a good diagnosis and find an ethical doctor familiar with chelation. There are oral chelation programs available now as well.