Understanding Glutathione Deficiency Invigor Medical 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 GNC L Glutathione Not all wellness support works the same. Glutathione is one of the body's naturally occurring antioxidants, known for helping protect cells from oxidative stress while supporting immune function and daily detoxification.