A specific phytosterol glycoside, β-sitosterol β-D-glucoside (BSSG), has been used experimentally to induce progressive parkinsonism in rodents—promoting α-synuclein aggregation, nigrostriatal degeneration, neuroinflammation, and reproducible motor deficits—thereby functioning as a neurotoxicant in several models and providing a widely used BSSG PD model [61,62]. This evidence concerns the gene SNCA and Parkinson disease.