Glutamate cysteine ligase as a diagnostic biomarker and therapeutic target in Parkinson's disease: a multi omics and experimental study European Journal of Medical Research Springer Nature Link Glutathione in Parkinson's disease Semantic Scholar Dysregulation of Glutathione Homeostasis in Neurodegenerative Diseases Dietary Antioxidants and Parkinson's Disease Randomized, double'blind, pilot evaluation of intravenous glutathione in Parkinson's disease