What is the real benefit of Glutathione?

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They say that its a master anti-oxidant, how true is this. I found an article in the internet that says: Glutathione is involved in detoxification—it binds to toxins, such as heavy metals, solvents, and pesticides, and transforms them into a form that can be excreted in urine or bile. Glutathione is also an important antioxidant. In preliminary research, dietary glutathione intake from fruit and raw vegetables has been associated with protection against some forms of cancer.1 2 Glutathione has also inhibited cancer in test tube3 and animal studies.4 In preliminary research, higher glutathione levels have also been associated with good health in older adults.5 What are the other benefits? Any risks or side effects?