Actually, that might be a real concern. Since Powerfull is significantly changing dopamine levels, the brain will naturally adjust over time to this change, which is an addiction of a sort because it feels bad to go off of it. Also, supplementing with high levels of L-Dopa and carbidopa can eventually cause nasty problems
http://www.sd-neurosurgeon.com/diseases/pd.html
(The quote is a link.)
These were studies of Parinson's patients, but perhaps some of the same side effects might occur with healthy subjects. I doubt the experiment has been done... we're doing it!
If you notice your hands being less steady or any twitches, I'd back it down.