Supplements and the entire field of 'health and nutrition' is awesome preventative practises and routines. However, 'preventative' medicine can also be seen as holding off inevitable sickness until something goes wrong; in which case it is now in the hands of the doctors and hospitals.
Nothing wrong with this at all, doctors do their jobs well. It is just that for the field of supplement, it is relatively common knowledge that supplements rarely act as therapy. Many supplements do good in preventing illness and to work towards hedonistic goals like fat loss or muscle building, but to actually reverse or otherwise reduce the side-effects of a disease state? Supplements usually fall on their face at this point in time.
The phrase 'reduce the risk of' does apply to supplements, but 'cure' does not usually.
We have introduced a page on Ganoderma Lucidum, the mushroom known as Reishi or Ling Zhi according to Traditional Chinese Medicine. I will outright say that it still has not been ultimately shown to be a therapeutic compound, but the studies are pointing in that direction. It has been used to reverse adenocarcinoma tumors in the colon (suggestive of reversing colon cancers) in the majority of persons given it, and there is one case study of it curing prostate cancer (however, replication of this in a sample of 52 gave lacklustre results; more evidence is needed to see why the first guy was cured, 51 people barely had any effect, yet that last guy showed significant reductions of prostatic symptoms. Seem to be some hyper-respoders) Beyond that, it has been shown to reduce viral replication in a study on hepatitis B, and has been shown to be a nice adjunct therapy in breast cancer and a good isolation therapy for anti-fatigue syndrome.
However, that is about the limit of human studies on the matter. Despite its promise, the amount of studies on Ganoderma Lucidum can still be counted with your fingers.
Although no really solid conclusions can be made at this time, I truly do believe this supplement to be promising and at least worth running by your medical doctor and redirecting him/her to the Examine page on Ganoderma Lucidum (to them, just a convenient collection of the studies) so they may see if it is a worthwhile adjunct therapy.