Hey fellas, I am just reporting this, I haven't a clue whether it means we should not take l-dopa etc. If you think about it, healthy people have plenty of dopamine compared to our meagre supply. So why haven't they got PD and we haven't!!! (joke) Go figure.
It just seemed a relevant interesting paper. Dopamine is synthesised also in the body, and acts as a hormone. However, I guess the authors here are talking about processes in the brain, not in the body.
The more I post, the more trouble I get into!!! LOL
Ron