In Japan, PSK is a prescriptive medication for use at a dosage of 3g per day as an adjunct immunotherapeutic agent together with chemotherapy and/or radiotherapy and surgical treatments of colorectal and gastric cancers. Safety evaluations have reported that the product is extremely safe and complied with LD-50 test.
In other parts of Asia, PSK is sold as an OTC product in pharmacies to be taken in 500 mg capsules or as an extract or as a tea. PSK is also marketed in the US as a food supplement or a class of mushroom ‘immunoceuticals’ with known immuno-therapeutic properties.
PSK is recorded as an anti-cancer fungal substance suited for treatment regimens used in cancer management by the American National Cancer Research Center71,72 but has not been evaluated by the Food and Drug Administration.
PSK Coriolus versicolor is available worldwide from various sources on the internet.
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