The only one that works from within the celluar walls. It is so powerful, because it is necessary in every single cell for the integrity of the cell to survive.
This antioxidant Glutathione out of all the rest is the only one that supports the immune system and does not become a free radical like vitamin C or A etc...
It is so beneficial in protecting all the other antioxidants in doing their job completly. The said thing is our environment is become worse with our soil, foods, water, & the air! Now they are able to find ways to increase our glutathione, which is the main defense against the constant attacks we undergo everyday.