Glutathione (GSH) is a small protein produced naturally in our cells as long as certain required elements are present. It is a major defense system against illness and aging. The lack of Glutathione is associated with Cancer, Alzheimer and many others.
Even though we take other antioxidants like vitamin C,D,A etc... they have a particular assignments but once they have done their job they become also a threat to our system that they were defending. Glutathione is the only one that's naturally produce within our cells that does not become a free radical that leads to oxidation stress in turn leads to cancer.
Although there are more than 60,000 published papers on the beneficial effects of gutathione replacements, it is still largely ignored by mainstream medicine.
In the near future the importance of glutathione will be widely recognized because it has the ability to boost the immune system and fight off the damage of free radicals on the cells.