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First, people do get glutathione from food without trying

[7] It is also commonly found in the atmosphere above marine areas, where it is used as a carbon source by the airborne bacteria Afipia

The role of glutathione peroxidase-1 in health and disease

Maintaining an adequate GSH redox status and 25-hydroxy-vitamin D levels will have the potential to reduce oxidative stress, enhance immunity and diminish the adverse clinical consequences of COVID-19 especially in African American communities having glucose-6-phosphate dehydrogenase (G6PD) deficiency, enzyme necessary to prevent GSH exhaustion and depletion (213, 310)