I'm XMRV+ and if my health problems were solved or even helped by B12, Vit C, Glutathione, NAC etc then I would have been cured or had better functionality a very long time ago. My heart sinks when I see a list of all the common things mentioned on CFS lists for years and years. For me, I can experiment with some of the Nsaids and NK / immune enhancing drugs (if I can afford to buy them) but I think that the answer will only come over time and for me, is going to be different or specific to the XMRV. In the poll there was no option for no change or made worse. I'd be ticking a lot of boxes then.