Glutathione: subcellular distribution and membrane transport Glutathione, often called the body's master antioxidant, actually depends on ascorbyl palmitate the fat soluble form of vitamin C to stay active and effective. While glutathione neutralizes free radicals inside cells, Glutathione is such a critical soldier in our line of defense that our bodies make it themselves. We even have mechanisms that recycle and reuse it. But what happens when our toxic SLC25A39 is necessary for mitochondrial glutathione import in mammalian cells Nature 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),