Glutathione is an amino acid and that acts as a powerful antioxidant to preserve and protect the brain and other body tissues by protecting them from the damage of free radicals and Glutathione Therapy Specialist in Orlando, FL 9 Health Benefits of Glutathione Glutathione, often dubbed the master antioxidant plays a crucial role in detoxification, immune function, and protecting our cells from oxidative stress. Here are some signs that your levels might be low: Persistent