My dad has been taking CBD oil for his Parkinson's. He has had Parkinson's for over must be at least 14yrs. It was diagnosed with the usual tremors.
For the last 4/5 yrs he has been taking CBD oil in a morning , he now takes it at night as well, just a few drops.
His hands tremor very little if at all, he doesn't shuffle although of course at 88 he does not walk spritely.
He notices if he does not take it.
Although we cannot prove it has helped his Parkinson's disease he swears by it. He originally started taking it for his back which he does really struggle with, that does not seem to have improved. But for his Parkinson's who knows!
When he went to a change of doctor as his usual one wasn't available the new Doc was very interested in him but of course they are not allowed to encourage other alternatives.
My dad does take the usual Parkinson's drugs, his Consultant last year just said "carry on with whatever it is you are doing/taking".