Here is a paper talking about HIV replication being inhibited by raising glutathione levels. They discuss a therapy of delivering glutathione to microphages. http://jac.oxfordjournals.org/cgi/content/full/52/4/551 "In AIDS patients, chronic inflammation and elevated levels of cytokines seem to be associated with lower levels of GSH: GSH levels decrease rapidly upon infection with HIV and continue to decline as the disease progresses. Investigators have shown that agents that increase intracellular levels of GSH inhibit HIV replication." It seems to me that this would have implications for XMRV and would explain (assuming you were XMRV +): a) why we have low glutathione b) why the methylation protocol (which raises glutathione) works as a treatment And also gives another method of raising glutathione, which might be another possible treatment.