tea has no affect on me. in fact, i stopped taking some green tea supplements since they seemed to interfere with my sinemet, might be the amino acids in the tea.
i'm doing pretty well after 11 years from my diagnosis, might be due to vigorous exercise which i stopped 4-5 years ago but have started up again. i played soccer for 5 years after i was diagnosed and quit after i started getting too many charlie horses, i also jogged a lot. i had to choose between taking more meds and playing sports/running and decided i couldn't risk a serious injury if my meds wore off. at that time didn't consider that level of exercise as possibly neuroprotective so didn't try to keep up that level of exercise doing something else.
kind of rambling, sorry.
but bottom line, no matter what you do it ultimately has a biochemical basis.
keep in mind there have been many studies on neuroprotection, there was a major study on vitamin C and E, of course there was COQ10, studies on many drugs including agonists, mao-b inhibitors like selegiline and recently azilect, hundreds of studies on mouse/rat models of pd, and nothing really works, they're still testing COQ10 at 2400mg doseages and still debating azilect. i remember reading an article by a canadian researcher that ginger was neuroprotective in rats, he couldn't wait to start a clinical trial and zippo. of course there's glutathione which was supposed to work and a study showed it didn't. not to say there isn't something that works but i've tried everything, chelation, I.V. glutathione, b-12 injections, low dose naltrexone, dozens of supplements, probably the only supplement that helped for a little bit was american ginseng, gave me a little more energy but had to stop because of high blood pressure. wasted a lot of money.
do a search on this web site on dextromethorphan, some posters say it might have slowed their progression. i hope i got the name right.