Inhibit The Formation Of Destructive Free Radicals! Glutathione is a tripeptide amino acid produced in the liver primarily from cysteine. It acts as a cellular antioxidant by inhibiting free radical proliferation. Antioxidants work in a variety of ways to reduce the effects of free radicals. They can greatly decrease the damage caused by free radicals, stop them from forming to begin with, or "oxidize" them by combining with them and neutralizing their harmful effects through stabilization. It is much useful to supply the body with the building blocks of the important enzymes so that the body can build them itself.