If you're not taking L glutamine for COVID you might want to be Critical Roles of the CysteineGlutathione Axis in the Production of Glutamyl Peptides in the Nervous System Glutamine vs Glutathione Differences Invigor Medical Glutathione L glutamine benefits, Glutathione, Glutathione benefits Disrupting Mitochondrial Pyruvate Uptake Directs Glutamine into the TCA Cycle away from Glutathione Synthesis and Impairs Hepatocellular Tumorigenesis ScienceDirect