Glutathione Side Effects: Everything You Need to Know Hone Health Glutathione is often called the body's master antioxidant. However, melatonin, the sleep hormone aka hormone of darkness, appears to have a much more important role in regulating the body's antioxidant defense and Endogenous non enzymatic antioxidants in the human body. Semantic Scholar Glutathione Side Effects Invigor Medical Most of us know melatonin is a natural sleep regulator, but it also had many other important functions, especially when it comes to fighting infections. Melatonin can boost immune function recharge glutathione