Glutathione: What It Is, Why You Need It, How You Can Increase It The Amino Company What is glutathione? Know as the most important antioxidant in the body, glutathione is an essential antioxidant manufactured in all cells, but primarily in the liver. It is essential because it Roles of glutathione in animals Antioxidant defense Download Table 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