Probiotics may help alleviate these symptoms and support a healthy gut microbiome
And the most important framing of all: these are compounds people discuss for certain goals, based on the interesting biology of their parts, not compounds shown to achieve those goals

Deboned chicken, chicken meal, lentils, peas, oatmeal, sun-cured alfalfa meal, pearled barley, natural chicken flavor, chicken fat (preserved with mixed tocopherols and citric acid), freeze-dried chicken, choline chloride, pea fiber, fish oil, potassium chloride, taurine, yeast extract, salt, inulin, zinc proteinate, L-lysine, DL-methionine, freeze-dried sweet potatoes, vitamin E supplement, apples, blueberries, carrots, cranberries, pumpkin, ground ginger, iron proteinate, freeze-dried pumpkin, L-carnitine, L-ascorbyl-2-phosphate (source of vitamin C), niacin supplement, Yucca schidigera extract, freeze-dried cod liver, freeze-dried New Zealand green-lipped mussel, freeze-dried kelp, d-calcium pantothenate, manganese proteinate, dried Bifidobacterium bifidum fermentation product, dried Enterococcus faecium fermentation product, dried Lactobacillus acidophilus fermentation product, dried Lactobacillus casei fermentation product, sunflower oil, riboflavin supplement, vitamin A supplement, thiamine mononitrate, copper proteinate, vitamin B12 supplement, menadione sodium bisulfite complex, pyridoxine hydrochloride, biotin, canola oil, vitamin D3 supplement, sodium selenite, folic acid, calcium iodate, rosemary extract

Common myths in the use of levodopa in Parkinson disease: when clinical trials misinform clinical practice