A respected Doctor here in North Carolina recommends reaching out to Dr. Laurie Mischley at Seattle Integrative Medicine, as she specializes in this field. She also wrote a book called Natural Therapies for Parkinson's Disease, which may be worth checking out. I believe her work goes beyond PD.
Dr. Mischley works via telehealth.
Seattle Integrative Medicine: (206) 525-8012
https://seattleintegrativemedicine.com/
Believe me, I have no interest in SIM other than to help those with these miserable disorders.
Regards,
Sagan