On the premise that negative results should carry the same weight as positive, I must report I have had no luck with CBD.
I have taken four different preparations of CBD purchased from four reputable suppliers; capsules, two versions of CBD oil, and a version that is "soluble" in water.
There have been a few times when I have felt a bit whizzy, but there has been no change in my PD symptoms. I really wanted some help with shoulder, neck and back pain, but there was none.
If others get relief from PD symptoms using CBD, that would be fantastic and I would be very happy for them. However, I am not one of them.