If there was one supplement, I would recommend for Parkinsons, it’s NAC. I get some of it through Restore Gold 1.6 grams and 1200 mg before bed for a total of 2.8 g. For me if I go any higher, it can cause me to be slightly anemic. I’ve been diagnosed for nearly 6 years and I’ve been off it twice. Both times I could feel myself progressing.
Also look into the carnivore diet. I’ve been able to quit my SSRI, which was causing my symptoms to be worse. I may be eating this way the rest of my life. I eat only one meal a day, so the protein doesn’t interfere with my medication.