Yun Zhi ( Coriolus mushroom) Yun Zhi means Cloud Mushroom in Chinese, its formal botanical name is Coriolus versicolor. The powder is extracted from Yun Zhi Mushroom (Cov-1 strain of Coriolus versicolor). Its active ingredients are PSK and PSP. The extracted polysaccharide called Polysaccharide K (PSK) is also known as Krestin. The PSP is a protein-bound polysaccharide peptides. The main component unit of the polysaccharide moiety is 1,4- and -1,6- glucans with -1,3- and 1,6- linkages. The reference of its usage can be traced in the Chinese Compendium of Materia Medica as far back as the 15th century. So far, There has been a number of scientific studies conducted and published by researchers and medical professionals in Asia on the effectiveness and safety of Yun Zhi. Animal studies investigating the efficacy of Coriolus versicolor indicate it has marked immune system-enhancing activity and a broad antineoplastic scope. It prolongs the survival time of irradiated (cancer-induced) mice by stimulating phagocytic activity of macrophages and improving the functions of the reticuloendothelial system. In overseas studies showed it may also has antiviral and antibacterial effects. Coriolus versicolor has been used for centuries in Traditional Chinese Medicine. Modern clinical research in Japan and China has focused on using the water extracts of this mushroom to stimulate and strengthen the immune health of people especially people with cancer. The immune-stimulating compounds found in Yun Zhi (Coriolus versicolor), known as PSK in Japan, has generated sales of several hundred million dollars a year, making them the world's top-selling natural products used by their cancer patients. In Japan, where PSK is dispensed as an authorized drug, it is sold for approximately $1,000 per month at a dosage of 3 grams per day. As a US food product, this same monthly supply can be sold for about $149 retail. We are offering a much better price with a highly concentrated product . Notice: The above statement has not been evaluated by the Food and Drug administration. This Product is not intended to diagnose, treat, cure or prevent any disease.