Coriolus Versicolor is a mushroom that grows primarily on trees. Traditionally, it has been used in China for several thousands of years. It’s recorded usage in history dates back to mid 1300’s during the Ming dynasty. In the 1970s researchers in Japan started experimenting with the mushroom by extracting it’s essence. The protein bound polysaccharide that was isolated from the mushroom in Japan is called Polysaccharide –K (Krestin, PSK). Their research found that PSK is effective as an immune system boosting agent. It is used in some European countries as well as China and in Japan, PSK is approved as an adjuvant being prescribed in conjunction of chemotherapy and is covered by their government health insurance. In the 1980’s Chinese researchers took looked at the research completed by the Japanese and formulated their own extract using an alcohol based extraction method. The result was Polysaccharide Peptide or PSP.


