Coriolus Versicolor

Source of Information: Memorial Sloan Kettering Cancer Center, the oldest and largest private cancer center, located in New York, founded in 1884.

Scientific Name: Coriolus versicolor, Trametes versicolor, Polyporus versicolor, Polystictus versicolor

Common Name: PSK, PSP, VPS, Turkey Tail, Yun Zhi, Kawaratake, Krestin

Brand Name: Krestin


How It Works

Bottom Line: Coriolus versicolor extracts have been studied in cancer patients with some positive results. However, more studies are needed to verify their effects.

Coriolus versicolor is a mushroom that is used in traditional Chinese medicine as a tonic. PSK and PSP, polysaccharide compounds isolated from Coriolus, were shown to improve immune function in patients with certain cancers when used along with chemotherapy.

Purported Uses
  • To prevent and treat cancer
    When used in combination with certain chemotherapy regimens, PSK has been shown to benefit patients following surgical removal of stomach and colorectal cancers. Clinical trials in patients with breast cancer, leukemias, and liver cancer do not show beneficial results.
  • To reduce the side effects of chemotherapy
    Animal studies suggest that PSK can prevent chemotherapy-induced immune suppression, but clinical trials have not been performed to confirm this effect in humans.
  • To stimulate the immune system
    Studies in animals and human volunteers suggest that PSK might stimulate the immune system.
  • To treat infections
    Coriolus’ effects against infections have not been studied in the laboratory or in clinical trials.
  • To reduce the side effects of radiation therapy
    Studies in mice and rats suggest that PSK can prevent radiation therapy-induced immune suppression, but this is yet to be proven in clinical trials.
Side Effects
  • Passage of dark colored stools
  • Darkening of fingernails
  • Low-grade toxicities have been reported when used along with chemotherapy agents. However, such effects may be caused by the chemotherapy agents themselves.
Special Point

PSK is approved for clinical use in Japan. Purified PSK, PSP extracts, or raw Coriolus extract alone or in combination with other herbs were used in clinical studies. However, the clinical effects of these products have not been compared.

Clinical Summary

Coriolus versicolor is a mushroom of the Basidiomycetes class. It is used in traditional Chinese medicine as a tonic, and recent studies suggest that it has immunostimulant and anti-tumor properties. Polysaccharide-K (PSK), a proprietary product derived from Coriolus, was developed for cancer treatment in Japan. When used as an adjuvant, PSK appears to improve survival rates in patients with gastric (1) (2) and colorectal (3) (4) (5) cancers. Other Coriolus extracts, such as polysaccharide-peptide (PSP) and VPS, are available as dietary supplements. One clinical study demonstrated that when used in conjunction with chemotherapy, PSP may benefit patients with advanced non-small cell lung cancer (6). Other clinical studies using Coriolus extract alone or in combination with other botanicals also suggest positive immunomodulatory effects (7) (8). However, studies on breast cancer (9), hepatocellular carcinoma (10), and leukemia (11) produced mixed results. A hot water extract of Coriolus, VPS, was found to enhance development of large intestinal tumors in mice (12). Coriolus extracts are generally well tolerated but minor adverse effects have been reported.

Many over-the-counter Coriolus products are not standardized, making it difficult to compare potency between brands. It is also unclear if PSK, PSP, and other Coriolus extracts have comparable effects.

Purported Uses
  • Cancer prevention
  • Cancer treatment
  • Chemotherapy side effects
  • Hepatitis
  • Herpes
  • Immunostimulation
  • Infections
  • Radiation therapy side effects
  • Strength and stamina

Proteoglycans: Polysaccharide-K (PSK), a beta-1,4-glucan (isolated from the CM-101 strain), polysaccharide-P (PSP), isolated from the COV-1 strain.

Mechanism of Action

Coriolus versicolor is thought to be a biological response modifier. PSK has been found to induce cytokine expression in human peripheral blood mononuclear cells in vitro. In other studies, PSP, as well as Coriolus extract, selectively induced apoptosis of human promyelocytic leukemia HL-60 cells (13) (23). It also increased apoptotic cell death in cells that had been treated with camptothecin. In these cells, PSP reduced cellular proliferation, inhibited cell progression through both the S and G2 phases of DNA replication, reduced 3H – thymidine uptake, and prolonged DNA synthesis time (14). An additional in vitro study showed that a medicinal mushroom blend that included Coriolus inhibited cell proliferation and induced cell cycle arrest at the G2/M phase in the invasive human breast cancer cell line MDA-MB-231 (15). DNA-microarray analysis indicated that the mushroom extract inhibited the expression of cell cycle regulatory genes and suppressed metastatic behavior through the inhibition of cell adhesion, cell migration, and cell invasion. The inhibition of metastatic behavior was linked to the suppression of urokinase plasminogen activator (uPA) (15). PSP has also been shown to inhibit the interaction between HIV-1 gp120 and CD4 receptor, HIV-1 transcriptase activity, and glycohydrolase enzyme activity associated with viral glycosylation (16).

Several animal studies report of synergism between PSK and biologic therapies, including a concanavalin A-bound L1210 vaccine and the IgG2a monoclonal antibody against human colon cancer cells (17). PSP induces cytokine production and T-cell proliferation, and prevents immune suppression due to cyclophosphamide in animal models. Peritoneal macrophages isolated from mice that were fed PSP show increased production of reactive nitrogen intermediates, superoxide anions, and tumor necrosis factor (18). PSP also shows analgesic activity in mouse models (19).

Non-small cell lung cancer patients have increased leukocyte and neutrophil counts, and increased serum IgG and IgM after consumption of PSP (6). Healthy volunteers as well as breast cancer patients who used a formula containing Coriolus and Salvia were found to have elevated counts of T-helper lymphocytes (CD4+), a high ratio of CD4+/CD8+, and elevated absolute counts of B-lymphocytes (7) (8). TNF-alpha and IL-8 gene expression were also found to be significantly induced after PSK administration in healthy volunteers and gastric cancer patients, although individual response varied (20). PSK was shown to induce apoptosis in promyelomonocytic leukemia HL-60 cells without inducing differentiation, and p38 MAPK (mitogen-activated protein kinas) was found to play an important role in this process (24).


Animal studies with radiolabeled PSK show that it is partially decomposed to small molecular products in the digestive tract. The full molecular spectrum of labeled PSK is absorbed within 24 h following oral administration in mice. Peak plasma levels of low molecular weight substances occur at 0.5-1 h in rats and 1-2 h in rabbits, while molecules the size of PSK appear in serum after 4, 10, and 24 h.

Radiolabeled PSK or its metabolites were detected in the digestive tract, bone marrow, salivary glands, thymus, adrenal gland, brain, liver, spleen, pancreas, and tumor tissue in sarcoma-bearing mice. Activity remained high longest in the liver and bone marrow.

Approximately 70% of radiolabeled PSK is excreted in expired air, 20% in feces, 10% in urine, and 0.8% in bile. Approximately 86% is excreted within 24 h.

Adverse Reactions

Adverse reactions from Coriolus are rare. But passage of dark colored stools (not originating from occult blood) (21), darkening of fingernails (22), and low-grade hematological and gastrointestinal toxicities have been reported when used in conjunction with chemotherapy agents (3). However, such effects may be caused by the chemotherapy agents themselves.

Herb-Drug Interactions

None known.

Herb Lab Interactions

None known.

Literature Summary and Critique

Wong CK, et al. Immunomodulatory effects of Yun Zhi and Danshen capsules in health subjects—a randomized, double-blind, placebo-controlled, crossover study. Int Immunopharmacology 2004;4:201-211.
One hundred healthy subjects were given a combination of Yun Zhi (Coriolus versicolor, 50 mg/kg body weight) and Danshen (Salvia miltiorrhiza, 20mg/kg body weight) capsules or placebo for four months. After a 2-month washout period, subjects who received Coriolus and Salvia capsules were given placebo while those on placebo received Coriolus and Salvia capsules for another four months. Researchers used flow cytometry and cDNA expression arrays to assess immune functions and gene expression. Results indicated that oral consumption of Coriolus-Salvia capsules significantly increased the peripheral blood mononuclear cell (PBMC) gene expression of interleukin (IL-2) receptor, increased the percentage and absolute counts of T helper cell and ratio of Thelper/Tsuppressor cells, and also the production of interferon-gamma from PBMC. Since T helper cells participate in both cell mediated and humoral immunities, Coriolus-Salvia combination may be used to enhance immune function. Studies are being conducted in cancer patients to determine the immunomodulating potential of these agents.

Purpose of this published study is scientific information and education, it should not be used for diagnosing or treating a health problem or disease. This website is designed for general education and information purposes only and does not substitute for professional medical advice, examination, diagnosis or treatment.


Source of Information: Memorial Sloan Kettering Cancer Center, the oldest and largest private cancer center, located in New York, founded in 1884.

  1. Nakazato H, et al. Efficacy of immunochemotherapy as adjuvant treatment after curative resection of gastric cancer. Study Group of Immunochemotherapy with PSK for Gastric Cancer. Lancet 1994; 343(8906): 1122-6.
  2. Niimoto M, et al. Postoperative adjuvant immunochemotherapy with mitomycin C, futraful and PSK for gastric cancer. An analysis of data on 579 patients followed for five years. Jpn J Surg 1988; 18(6): 681-6.
  3. Ohwada S, et al. Adjuvant immunochemotherapy with oral Tegafur/Uracil plus PSK in patients with stage II or III colorectal cancer: a randomised controlled study. Br J Cancer 2004; 90(5): 1003-10.
  4. Mitomi T, et al. Randomized, controlled study on adjuvant immunochemotherapy with PSK in curatively resected colorectal cancer. The Cooperative Study Group of Surgical Adjuvant Immunochemotherapy for Cancer of Colon and Rectum (Kanagawa). Dis Colon Rectum 1992; 35(2): 123-30.
  5. Torisu M, et al. Significant prolongation of disease-free period gained by oral polysaccharide K (PSK) administration after curative surgical operation of colorectal cancer. Cancer Immunol Immunother 1990; 31(5): 261-8.
  6. Tsang KW, et al. Coriolus versicolor polysaccharide peptide slows progression of advanced non-small cell lung cancer. Respir Med 2003; 97(6): 618-24.
  7. Wong CK, et al. Immunomodulatory effects of yun zhi and danshen capsules in health subjects—a randomized, double-blind, placebo-controlled, crossover study. Int Immunopharmacol 2004; 4(2): 201-11.
  8. Wong CK, et al. Immunomodulatory activities of Yunzhi and Danshen in post-treatment breast cancer patients. Am J Chin Med 2005; 33(3): 381-95.
  9. Iino Y, et al. Immunochemotherapies versus chemotherapy as adjuvant treatment after curative resection of operable breast cancer. Anticancer Res 1995; 15(6B): 2907-11.
  10. Suto T, et al. Clinical study of biological response modifiers as maintenance therapy for hepatocellular carcinoma. Cancer Chemother Pharmacol 1994; 33: S145-8.
  11. Ohno R, et al. A randomized trial of chemoimmunotherapy of acute nonlymphocytic leukemia in adults using a protein-bound polysaccharide preparation. Cancer Immunol Immunother 1984; 18(3): 149-54.
  12. Toth B, Coles M, Lynch J. Effects of VPS extract of Coriolus versicolor on cancer of the large interstine using a serial sacrifice technique. In Vivo 2006;20(3):341-6.
  13. Yang X, et al. The cell death process of the anticancer agent polysaccharide-peptide (PSP) in human promyelocytic leukemic HL-60 cells. Oncol Rep 2005; 13(6): 1201-10.
  14. Wan JMF, Sit WH, Yang X, Jiang P, Wong LY. Polysaccharopeptides derived from Coriolus versicolor potentiate the S-phase specific cytotoxicity of Camptothecin (CPT) on human leukemia HL-60 cells. Chinese Medicine. 2010;5:16.
  15. Jiang J, Sliva D. Novel medicinal mushroom blend suppresses growth and invasiveness of human breast cancer cells. Int J Oncol. 2010 Dec;37(6):1529-36.>
  16. Collins RA, Ng TB. Polysaccharopeptide from Coriolus versicolor has Potential for Use Against Human Immunodeficiency Virus type I Infection. Pharmcology Letters 1997; 60(25): 387-387.
  17. Tsukagoshi S, et al. Krestin (PSK). Cancer Treat Rev 1984; 11(2): 131-55.
  18. Liu WK, et al. Activation of peritoneal macrophages by polysaccharopeptide from the mushroom, Coriolus versicolor. Immunopharmacology 1993; 26(2): 139-46.
  19. Ng TB, Chan WY. Polysaccharopeptide from the mushroom Coriolus versicolor possesses analgesic activity but does not produce adverse effects on female reproductive or embryonic development in mice. Gen Pharmacol 1997; 29(2): 269-73.
  20. Kato M, et al. Induction of gene expression for immunomodulating cytokines in peripheral blood mononuclear cells in response to orally administered PSK, an immunomodulating protein-bound polysaccharide. Cancer Immunol Immunother 1995; 40(3): 152-6.
  21. Shiu WCT, et al. A Clinical Study of PSP on Peripheral Blood Counts during Chemotherapy. Phytotherapy Research 1992; (6): 217-218.
  22. Kidd, PM.The use of mushroom glucans and proteoglycans in cancer treatment. Altern Med Rev 2000 5(1): 4-27.
  23. Lau CB, et al.Cytotoxic activities of Coriolus versicolor (Yunzhi) extract on human leukemia and lymphoma cells by induction of apoptosis. Life Sci 2004; 75(7): 797-808.
  24. Hirahara N, Edamatsu T, Fujieda A, et al.Protein-bound polysaccharide-K (PSK) induces apoptosis via p38 mitogen-activated protein kinase pathway in promyelomonocytic leukemia HL-60 cells. Anticancer Res. 2012 Jul;32(7):2631-7.


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