Glutathione genetic errors, such as GSTM1, presuppose the effect platinum-based drugs will have on your cancer and side effects from the platinum-based drugs. More glutathione that can be recycled or created then the fewer problems from the platinum-based drugs. It's because glutathione is the way our body reaches out and grabs these drugs (or any other toxins) and removes them safely. (The more GST errors -- GSTP1 GSTM1, GSTO1, etc -- the more problems you will have). A functional glutathione is a godsend. And great for quality of life.