glutathione generation at the Crossroads of Redox Homeostasis and Glucose Metabolism in Diabetes Mellitus | Indian Journal of Clinical Biochemistry Glutathione accelerates the cell cycle
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Handling should be conducted using appropriate laboratory safety procedures and sterile technique where applicable

If it promotes blood vessel growth, could it theoretically feed tumor growth
Dietary antioxidants and the long-term incidence of age-related macular degeneration: the blue mountains eye study

In short, its because of convenience