IngredientesTrametes versicolor — also known as Coriolus versicolor and Polyporus versicolor — is a common polypore mushroom found throughout the world. The accepted scientific name is Trametes versicolor (L.) Lloyd, although it has been known by other names, notably Coriolus versicolor (L. ex Fr.) Quél. In traditional Asian medicine systems it carries distinct vernacular names: it is known in traditional Chinese medicine as Yun Zhi (云芝, meaning "cloud mushroom") and in Japan as Kawaratake ("roof mushroom"). In the English-speaking world, owing to its shape being similar to that of a wild turkey's tail feathers, T. versicolor is most commonly referred to as turkey tail.
Meaning "of several colors," versicolor accurately describes this fungus that displays a unique blend of markings. Trametes versicolor belongs to the Polyporaceae family in the fungal kingdom: Division Basidiomycota, Class Agaricomycetes, Order Polyporales, Family Polyporaceae, Genus Trametes, Species T. versicolor.
Trametes versicolor, commonly known as Turkey Tail, is a common wood-decaying basidiomycete that grows on deadwood and dying trees across the world. It is a polypore mushroom where spores are produced on basidia inside of tubes located on the underside of the fruiting body. The thin fruiting bodies, which lack stipes, are highly variable in color with sharply contrasting concentric zones of color on the surface of the cap, which is finely fuzzy or velvety. The fruiting body is somewhat tongue-shaped, with no discernible stalk, and the tough flesh is 1–3 millimetres thick.
It is saprophytic and feeds on dead or decaying hardwoods like logs, stumps, snags, and wood chips. There are many other species of Trametes, some of which are difficult to distinguish from turkey tail. Internal transcribed spacer sequences alone have been found inadequate to distinguish turkey tail from other species of Trametes, so additional molecular characters are required for that task.
While Turkey Tail is very common throughout the world and considered "edible," it is not commonly consumed as food due to its tough and leathery texture. It is, however, prepared for consumption in many ways, such as boiling for teas or used for soup stocks. Extracts of turkey tail mushroom and its constituents PSK and PSP are widely available as supplements in capsule, liquid tincture, and powdered form. Pharmaceutical-grade preparations exist: the research community has identified a pharmaceutical-grade turkey tail product made in Japan, where turkey tail has been a widely used cancer treatment for more than 30 years; this takes the form of protein-bound polysaccharide K (PSK), a powdered turkey tail derivative produced using a hot-water extraction method.
Extracts of turkey tail or the mushroom itself are commonly marketed as a dietary supplement for various health benefits, and quality can vary due to inconsistent processing and labeling. The FDA does not regularly review the way that supplements are made, so all batches and brands of mushroom supplements may not be the same.
Yun Zhi (Trametes versicolor), known as turkey tail, is one of the oldest medicinal mushrooms in Asia with over 2,000 years of documented use. Although the oldest and most comprehensive written documentation about Yun Zhi dates from the 15th century during the Ming Dynasty, historical records suggest that its medicinal use in China extends back more than 2,000 years. These mushrooms have been documented in ancient texts, such as the Compendium of Materia Medica by Li Shizhen, a renowned Chinese herbalist from the Ming Dynasty.
During the Ming Dynasty (1368–1644), its knowledge was consolidated in medical texts to strengthen the immune system and treat lung conditions. In the context of traditional Chinese medicine, Yun Zhi was classified among remedies that tonify Qi (vital energy), particularly associated with the Spleen-Pancreas and Stomach meridians. Turkey tail has been used in traditional Chinese medicine to treat lung diseases for many years. The polysaccharides of the fruiting bodies are sweet and mild in taste and are commercially marketed as a tea used in Asian and European traditional medicine. T. versicolor has been consumed for centuries in Asia as part of a traditional diet and has been used medicinally; folklore remedies of turkey tail include the treatment of lung and liver infections. In China, turkey tail has been used as a preventive and curative agent for liver infections and liver cancer.
In Japan, turkey tail has been used to strengthen the immune system when given with standard cancer treatment. In 1971, Japanese scientists isolated PSK, approved in 1977 as an adjuvant cancer therapy, scientifically validating millennia of traditional wisdom. T. versicolor extract (PSK) is approved as a pharmaceutical-grade medicine in Japan and has been used for more than 30 years as a treatment for cancer.
Ancient Chinese formulations of Coriolus versicolor have long been believed to generally promote health, strength, and longevity. Medicinal mushrooms have been used for hundreds of years, mainly in Asian countries, for treatment of infections. More recently, they have also been used in the treatment of pulmonary diseases and cancer.
Polysaccharide K (PSK) is the best known active compound in turkey tail mushrooms. Polysaccharide-K (Krestin, PSK) is a protein-bound polysaccharide isolated from the mycelium of Trametes versicolor. The best-known constituent of turkey tail is the glycoprotein mixture known as PSK. PSK is not a homogeneous substance, with a range of molecular weights averaging 9.4 kDa (range 5–300 kDa). The glycoprotein molecules are composed of a main chain beta-(1,4) glucan with beta-(1,3)– and beta-(1,6)–linked side chains. Small amounts of galactose, mannose, and arabinose have also been detected in the hydrolysate.
The bioactive components of Coriolus versicolor extracts include two polysaccharopeptides (PSPs) derived from two different strains: COV-1 (PSP) most commonly used in China, and CM101 (polysaccharide krestin, PSK) used in Japan. They are made from polysaccharides covalently bonded to peptides through O- or N-glycosidic bonds. Both products have been approved as medicines primarily as adjuvants in cancer therapy.
Like other medicinal or edible mushrooms, the majority of the therapeutic polysaccharides derived from T. versicolor are beta-glucan. The activity is generally considered to be caused by the presence of high-molecular-weight polysaccharides (beta-glucans) in the mushrooms, although other constituents may also be involved. T. versicolor contains an abundance of physiologically bioactive compounds, most notably β-glucan polysaccharides, which are responsible for antioxidant, neuroprotection, hypolipidemic effects, immune-modulating effects, and anticancer effects.
HPLC–MS/MS-based studies identified 38 phenolic compounds in the fruiting body of C. versicolor belonging to the flavonoid group (flavones, flavonols, flavanone, flavanols, biflavonoids, isoflavonoids) and hydroxy cinnamic acids. Although ethanol and methanol extracts are generally the richest sources of these phenolic compounds, water extracts were also shown to contain considerable amounts of baicalein, baicalin, quercetin, isorhamnetin, catechin, amentoflavone, p-hydroxybenzoic acid, and cyclohexanecarboxylic acid. The biological activities of the water extracts of C. versicolor, especially in the antioxidant area, must therefore account for the cumulative effects of these phenolic compounds.
Jin et al. isolated 27 compounds from the fruiting body of Trametes versicolor, identified through NMR spectroscopy, including nine triterpenoids, eight sterols, two ribonucleotides, four phenols, three glycosides, and one feron. Isolated sterols include two ergostanes — 5α,8α-epidioxy-22E-ergosta-6,22-dien-3β-ol and 5α-ergost-7,22-dien-3β-ol — and a lanostane, 3β-hydroxylanostan-8,24-diene-21-oic acid (trametenolic acid). Ergosterol peroxide has been reported to exhibit immunosuppressive, antiviral, anti-inflammatory, and antitumor activities in vitro.
Like other edible mushrooms, the fruiting body of C. versicolor is composed of carbohydrates, proteins, amino acids, and minerals. T. versicolor has been shown to have a high content of histidine, which is the main amino acid in its composition.
Trametes versicolor is known to enhance innate and adaptive immune responses. Turkey tail polysaccharides activate Toll-like receptor 2 (TLR2) on innate immune cells, triggering downstream signaling that enhances both innate and adaptive immunity. PSK extract modulates the immune response through stimulation of both extracellular PRR (TLR2) and intracellular pathogen sensors (NLRP3 inflammasome). The immune effects are mediated through the mushroom's stimulation of innate immune cells, such as monocytes, natural killer cells, and dendritic cells.
The constituents responsible for immunological effects are believed to be the polysaccharides. However, recent research suggests that the lipid fraction of PSK isolated from T. versicolor is instrumental to its TLR-2 induction activity. While literature is available on mushroom isolates and derivatives like PSP, PSK, or beta-glucans, there is evidence to support the role of other compounds in their absorption and distribution in the human body. One research group found that a structurally distinct lipid acts synergistically with the protein-bound beta-glucan in its TLR-2 agonist activity.
Both PSK and PSP belong to a group of substances called biological response modifiers (BRMs). As non-specific immunosupportive agents, they work to restore balance to the immune system without a specific target.
Fungus extract may be rich in many proven antioxidant substances, such as polysaccharides or phenols. T. versicolor has been reported to contain 28 phenolic compounds; these phenolic compounds may be mainly accountable for its antioxidant activity. The high degree of free-radical scavenging may be due to a protonated form of the imidazole ring. Positively charged histidine is able to function as a proton donor for active free radicals like DPPH• and ABTS•+, which must assume a reduced form in order to become inactivated.
Turkey Tail has demonstrated prebiotic-like activity in vitro and in vivo. In vitro research has shown that the fermentation of PSP extract by gut bacteria increases the beneficial bacteria Bifidobacterium and Lactobacillus spp., while reducing less desirable bacteria, Clostridium difficile, Staphylococcus spp., and Enterococcus spp. This study also saw an increased level of lactate and beneficial short-chain fatty acids.
There have been many peer-reviewed publications on Turkey Tail in cancer treatment, including 37 in vitro articles, 55 animal studies, 43 published human clinical studies, and 11 review articles in gastrointestinal, breast, and lung cancer. Trametes versicolor has been assessed in Phase I, II, and III randomized clinical trials in stomach, colorectal, esophageal, and breast cancer patients.
The strongest evidence comes from gastric and colorectal cancer: in multiple large RCTs in Japan, PSK (3 g/day) given after curative surgery plus chemotherapy significantly improved 5-year disease-free survival rates. All five nonrandomized controlled trials reported improved median survival with the use of PSK in combination with conventional radiation therapy and/or chemotherapy. PSK 3 g/d with concurrent chemotherapy was used in all RCTs.
People with colorectal cancer who were treated with PSK alongside chemotherapy showed better survival across several studies, with stronger evidence for those taking it alongside oral chemotherapy (as opposed to intravenous). There was preliminary evidence that people with certain biomarkers — detectable serum immunosuppressive acidic protein (IAP) or a carcinoembryonic antigen (CEA) level of 3 ng/mL or more — were more likely to benefit. One trial among people with rectal cancer alone did not show evidence of better survival.
A meta-analysis of 13 clinical trials on C. versicolor produced particularly notable findings: it reported an impressive result showing a significant survival advantage when compared with standard conventional anti-cancer agents alone; for example, a 9% absolute reduction in 5-year mortality was recorded, with one additional patient alive for every 11 patients treated.
The Cochrane Collaboration conducted a systematic review specifically on colorectal cancer: the Cochrane Review on Coriolus/Turkey Tail in colorectal cancer found low-certainty evidence of a small 5-year survival benefit when PSK is added to standard treatment. A Cochrane review examining Coriolus extracts (primarily PSK) in colorectal cancer found very low-certainty evidence of a small survival benefit at 5 years when PSK was added to chemotherapy or radiotherapy compared to conventional treatment alone. Longitudinal studies from Japan involving patients treated with surgery plus chemotherapy and PSK report prolonged overall and disease-free survival versus chemotherapy alone, with minimal treatment-related adverse effects.
Evidence strength characterization: Turkey Tail mushroom extracts — particularly PSK — have the strongest clinical evidence as adjuvants to surgery and chemotherapy in select cancers (e.g., gastric, colorectal, lung) within long-standing Japanese oncology practice. There is moderate evidence for immune modulation and modest survival benefits, but the overall evidence base is limited by study design heterogeneity and evolving treatment standards. PSK/PSP should be viewed as supportive agents rather than primary cancer therapies.
Systematic reviews of studies on PSK in lung cancer suggest benefits in immune function and hematological status. PSP 3.06 g/day for 1 month was administered to conventionally treated patients with stage III to IV non-small cell lung cancer (NSCLC). Clinical trials using active fractions of Trametes (namely PSK and PSP) published in Japan and Korea suggest that T. versicolor polysaccharide-peptide constituents improve disease-free and overall survival in several different types of cancer, including stomach, esophagus, lung, colorectal, prostate, and breast adenocarcinomas. The evidence here should be considered preliminary and heterogeneous; lack of clear clinical data precludes firm recommendations for these extracts at this time.
A 2012 Phase 1 clinical trial conducted at Bastyr University (funded by the NIH) gave breast cancer patients 3, 6, or 9 grams of turkey tail mushroom daily after completing radiation therapy. The results showed dose-dependent increases in natural killer cell activity and increased lymphocyte counts — markers of enhanced immune surveillance. Patients received chemotherapy and radiation therapy, with or without PSK; this study found that PSK increased the number of cancer-killing immune cells and had anticancer effects in tissue that received radiation therapy.
Recent clinical research involving consumption of Tv mycelium on rice substrate by Standish and colleagues suggests NK cell induction in women with breast cancer.
Although polysaccharide-K, an extract of T. versicolor, is approved in Japan as an adjuvant therapy in cancer treatment, it is not approved in the United States for treatment of cancer or any clinical condition. Products using Coriolus versicolor extracts are currently approved as adjunct therapy in China and Japan for cancer patients already receiving chemotherapy or radiotherapy. The FDA has not approved the use of turkey tail or its active compound PSK as a treatment for cancer or any other medical condition.
The medicinal mushroom Trametes versicolor is often prepared for consumption as a powder from the fungal mycelium and the fermented substrate on which it grew. A study on human peripheral blood cells in vitro showed that the mycelium of Trametes versicolor and its fermented substrate activate NK cells as well as lymphocytes and monocytes. Evidence for immune modulation in otherwise healthy adults is less well developed than the cancer adjuvant data; most mechanistic data currently derives from in vitro and animal experiments.
A clinical trial tested PSP from turkey tail against amoxicillin for impacts to GI microbiota compared to controls; Tv PSP acted as a prebiotic in its alteration of the human GI microbiome (Pallav et al., 2014). In a randomized clinical trial, 1,200 mg of PSP was administered three times a day on an empty stomach alongside the antibiotic amoxicillin. Although amoxicillin alone led to an increase in Escherichia and Shigella, the PSP group had distinctive positive changes in the human microbiome, consistent with its activity as a prebiotic.
A randomized clinical trial in healthy adults found PSP supplementation increased bacterial diversity and helped restore balance after antibiotics — a promising sign for microbiome resilience. Laboratory work also indicates Turkey Tail extracts can encourage beneficial species while discouraging less desirable strains — a clear prebiotic-like activity. Note that results vary between individuals and more long-term human trials would be valuable.
Previous laboratory studies found turkey tail extract may have antiviral properties against HIV, human papillomavirus, and herpes simplex virus. It may also have antifungal action against Candida albicans. However, studies differ on how strong these effects may be, and not many have tested turkey tail extracts as solo treatments for these infections in humans. This area of research remains at the in vitro and preclinical stage and does not yet constitute clinical evidence for antiviral indications in humans.
A combination medicinal mushroom formulation of T. versicolor plus Ganoderma lucidum was observed to clear oral human papilloma virus (HPV) in patients with HPV-positive gingivitis. This finding is limited and requires further replication.
Turkey tail has been shown to increase strength and reduce physical fatigue during exercise, reduce blood sugar and improve insulin resistance, and help prevent obesity due to high dietary fat intake in animal studies. However, these benefits have not been confirmed in humans. In vitro research in human hepatoma HepG2 cells showed that extracellular polysaccharopeptides (ePSP) from T. versicolor reversed insulin-resistance-induced decreases in glucose uptake in a dose-dependent manner. This evidence is preliminary and remains at the in vitro or animal level.
A 2024 review notes that turkey tail has antibacterial properties against several common pathogens. In vitro studies have shown that mushroom extract exhibited antioxidant activity comparable to the artificial antioxidant BHA in DPPH and N2O2 scavenging assays. These findings are from laboratory studies and have not been confirmed in clinical trials.
The following dosages are drawn directly from reported studies and clinical references; they are not recommendations.
The safety record for PSK is well established in Japan. Few adverse events have been reported in patients treated with PSK. Adverse effects observed include diarrhea, darkened stools, and darkened nail pigmentation. PSK is considered to be very well tolerated; no clinically important adverse effects were observed for PSK 3 g/day when given up to 7 years as an adjunct to standard chemotherapy in patients with curatively resected colon cancer.
Mild heartburn and mild chest pain were reported in one clinical study among two people taking 3 and 6 grams of turkey tail, respectively (Torkelson, ISRN Oncol 2012). One participant receiving PSP reported increased gas and burping (Pallav, Gut Microbes 2014). PSK was linked with nail discoloration in one study (Fritz, Integr Cancer Ther 2015).
The turkey tail constituents PSK and PSP appear to be safe when used for up to 5 years, typically in doses of about 3 grams daily. A comprehensive safety review (PMID: 12168863) covering decades of clinical use in Japan found PSK at 3 g per day for up to 36 months to be consistently well tolerated. Adverse events were rare and mild — occasional nausea and a small number of reports of darkened nail coloration. No significant hepatotoxicity and no drug interactions with standard chemotherapy were identified.
Mushrooms grown in contaminated soil collect toxins and heavy metals, making safety a concern. Given that over 100 strains of the fungi are known to occur, one must recognize the diversity of products coming from different genetic and environmental sources, including the in vitro culture conditions of their mycelial production.
Although PSK is approved in Japan as an adjuvant therapy in cancer treatment, it is not approved in the United States for treatment of cancer or any clinical condition. The FDA regulates dietary supplements separately from foods, cosmetics, and drugs. The FDA's Good Manufacturing Practices require that every finished batch of supplements is safe and that the claims on the label are true and do not mislead the consumer. However, the FDA does not regularly review the way that supplements are made, so all batches and brands of mushroom supplements may not be the same.
Contraindications have not been formally determined. Use during pregnancy and lactation should be avoided; information regarding safety and efficacy in pregnancy and lactation is lacking. Individuals on immunosuppressive therapy, such as those undergoing organ transplants, should also exercise caution with turkey tail mushroom due to its immune-stimulating properties, which could theoretically interfere with treatment.
There is little evidence that turkey tail mushroom extracts or PSK are useful for treating cancer or any medical condition as a standalone therapy. The compound has been studied almost exclusively as an adjunct to standard-of-care regimens, not as a primary or replacement treatment. The overall evidence base is limited by study design heterogeneity and evolving treatment standards.
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Trametes versicolor (Turkey Tail mushroom) contains Polysaccharide-K (PSK, krestin) and PSP, with robust clinical evidence for immunostimulation in post-cancer treatment recovery. Approved as an immunological adjuvant in Japan and China for post-chemotherapy immune restoration. Relevant to general post-illness immune recovery.
Turkey Tail (Trametes/Coriolus versicolor) contains polysaccharide-K (PSK) and polysaccharide-peptide (PSP), which are among the most clinically studied mushroom immunomodulatory compounds. It supports recovery of exhausted T-cells and NK cell activity, and is used in oncology as adjunct immunotherapy. Clinical evidence supports its role in immune exhaustion relevant to post-viral recovery.
Turkey tail mushroom (Trametes versicolor) contains polysaccharide-K (PSK) and polysaccharide-peptide (PSP) with well-documented immunomodulatory effects. Clinical evidence supports its role in enhancing antiviral immune defense including T cell and NK cell activity. It has been used in Asian traditional medicine and studied in clinical trials for immune support against viral pathogens including HPV.
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