Bioconjugates of curcumin display improved protection against glutathione depletion mediated oxidative stress in a dopaminergic neuronal cell line: Implications for Parkinson's disease ScienceDirect Glutathione S transferase: A keystone in Parkinson's disease pathogenesis and therapy ScienceDirect Is it time to back NAC? The Science of Parkinson's Randomized, double'blind, pilot evaluation of intravenous glutathione in Parkinson's disease