Glutathione is nicknamed the master antioxidant because it is the most abundant, body produced (endogenous) antioxidant found in every cell, essential for neutralizing free radicals, recycling other antioxidants (like Vitamin C and E), Endogenous Glutathione Conjugates: Occurrence and Biological Functions Pharmacological Reviews Figure 1 from The role of glutathione in photosynthetic organisms: emerging functions for glutaredoxins and glutathionylation. Semantic Scholar Glutathione The Ultimate Antioxidant Purifi IV Glutathione: your body's master antioxidant & detoxifier Glutathione is the 2nd most abundant molecule in the body, just after water. Its made from three amino acids: glycine, cysteine, & glutamate.