Turkey tail, named for its colorful stripes, is probably the most promising mushroom as far as research is concerned. Many of the studies centered around the medicinal benefits of mushrooms have been small-scale studies. Turkey tail is, at this point, the most well researched mushroom in larger scale studies.
Turkey Tail has two powerful polysaccharides called PSP and PSK (or Kreskin) which is at the center of a $5.4 million collaboration between Bastyr University, the University of Washington and funded by the National Institutes of Health (NIH). Researchers found that taking Turkey Tail daily improves immune function when dosed daily to women with stage I to III breast cancer. PSP has been shown to significantly enhance immune status in up to 97 percent of cancer patients.
Unlike most pharmaceutical drugs, Turkey tail also showed no negative side effects in the study.
Turkey tail is also something I use in some of my patients struggling with gut overgrowths, such as small intestinal bacterial overgrowth (SIBO) and candida overgrowth.