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because selenium is part of the enzyme glutathione-peroxidase Small molecule selenium-based glutathione peroxidase 4 mimetic inhibits lipid peroxidation and protects cultured neurons from ferroptosis Modeling the Catalytic Cycle of
Description
(2) protocols have moved toward lower per-session doses given more frequently, which research suggests is more effective than infrequent high-dose sessions

It plays an important role as a nutrient in enhancing the metabolism and provides the body an antioxidant defense

In the old days the Schillings test helped to solve this question
Glutathiones Secret Superpower: Recycling Itself Glutathione is one of the few antioxidants that can recycle itself