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The supernatants were filtered (0.2- m filter), transferred to glass HPLC vials, and kept at 80 C prior to performing a targeted metabolomic analysis consisting of 203 metabolite references at the UT Southwestern Medical Center Metabolomics Core Facility (Sciex QTRAP 6500 + mass spectrometer)

What to look for on the label: Reduced L-Glutathione or L-Glutathione (Reduced) listed as the primary ingredient The specific amount per capsule/serving clearly stated in milligrams Avoid products that simply say glutathione without specifying the form HealthyHeys L-Glutathione 500mg uses 100% reduced L-glutathione in vegetarian capsules the form that matters for oral supplementation

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10.1016/j.brainresbull.2020.12.003 105 Organization, World Health (2017)