Coriolus versicolor is a mushroom used in traditional Asian herbal remedies (see Chinese Herbal Medicine). Two substances extracted from
the mushroom, polysaccharides K (PSK) and polysaccharides-peptide (PSP), are being studied as possible complementary cancer treatments.
Versicolor polysaccharides (VPS), another extract from the mushroom that is sold as a dietary supplement in the United States, is also being studied. A polysaccharide is a carbohydrate formed by a large number of sugar molecules.