Coriolus Versicolor

Other common name(s): "Turkey Tail" mushroom, Yun zhi, polysaccharide K (PSK), polysaccharide-peptide (PSP), versicolor polysaccharide (VPS)

Scientific/medical name(s): Coriolus versicolor, Trametes versicolor

Description

Coriolus versicolor is a mushroom used in traditional Asian herbal remedies (see Chinese Herbal Medicine). Two substances extracted from the mushroom, polysaccharide K (PSK) and polysaccharide-peptide (PSP), are being studied as possible complementary cancer treatments. Verisicolor polysaccharid (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.

Overview

Available scientific evidence does not support claims that the raw mushroom itself is an effective anti-cancer agent in humans. But there is some scientific evidence that substances derived from parts of the mushroom may be useful against cancer. Clinical trials suggest that PSK may help people with certain types of cancer by increasing survival rates and lengthening periods of time without disease, without causing major side effects. PSK is commonly used with other cancer treatments in Japan. PSP and VPS have not been studied as thoroughly.

How is it promoted for use?

Herbalists claim Coriolus versicolor and its extracts are useful against a number of conditions, including cancer and certain infections. PSK, one of the substances that can be extracted from Coriolus versicolor, is believed to be a strong anti-oxidant, a compound that blocks the action of free radicals, activated oxygen molecules that can damage cells.