Glutathione helps stave off the impact of oxidative stress, which may, in turn, reduce disease. An article cited in Journal of Cancer Science and Therapy indicated that glutathione deficiency leads to increased levels of oxidative stress, which might lead to cancer.

Furthermore, reduced glutathione (GSH) acts as a hydrogen donor in the detoxification of hydrogen peroxide. As a dietary supplement, GSH possesses various systemic effects such as improvement of liver abnormalities,3,4 improvement of diabetic complication,5 protection from viral infection,6 and antitumor activity.

It has two forms: one is in an oxidized state and the other in a reduced state. The reduced form (GSH) is the active state that is able to neutralize free radicals in the body. ... Doing this protects the glutathione and dramatically improves absorption. Natural glutathione is primarily made inside our cells.

GLUTATHIONE REDUCED