Glutathione is a powerful antioxidant naturally produced by the liver
Studies show that low levels of glutathione and high levels of oxidative stress are associated with higher risks for cancer, diabetes and arthritis
Alfaris N, Waldrop S, Johnson V, Boaventura B, Kendrick K, Stanford FC
Lysosomes and oxidative stress in aging and apoptosis
Just because something works does not mean it is going to work every single time
S-Methylglutathione, which is lacking the free thiol group present in glutathione, stimulates neither the nonenzymatic nor the GST-catalyzed isomerization, but inhibits the glutathione-independent GST catalysis (Pettersson and Mannervik, 2001)