Judy: The E. C, Beta Carotene and (I think) the Stresstab (all of which are either Neuro prescribed or Movement Disorder Specialist prescribed) are all antioxidants to combat free radicals in the body. Someone more medical than me will have to say why it is important to neutralize free radicals. The Selenium and grape juice are also antioxidants added by me with their concurrence. I guess you can't have too many antioxidants. The Gluchosamine Chondroitin is for joint pain and a stiff neck unrelated to PD; the calcium is for bone strength also unrelated to PD; and the Coenzyme Q10 is theoretically for energy and theoretically because it may be neuroprotective against PD progression. Some form of the latter statement is currently under test in a few places in the country. I tried to join but they only wanted pwp who were not yet on medication. Now for the question you didn't ask -- is any of it doing any good. The answer is that I don't know if any of it is helping because there is nothing positive to see. By the same token, would I be worse off in one aspect or another if I weren't taking all this stuff. The only way to find out is to stop and I'd rather not, as long as none of it is causing me harm. By the way, appropriately enough, I forgot to mention that I also take Ginkgo Biloba for memory. It appears that it may not quite be doing the job. Regards, Paul H. Lauer