Turkey tail: properties, uses, pros, cons, safety

(Trametes versicolor)

Turkey tail (Trametes versicolor) is a wood-decaying basidiomycete in the family Polyporaceae, very common on hardwoods and recognizable by thin, shelf-like fruiting bodies arranged in overlapping rosettes with multicolored concentric zoning. In commercial contexts it is often positioned as a “functional” mushroom, especially as extracts. It is useful to note that historical synonyms are frequently encountered in the literature and on the market (notably Coriolus versicolor and Polyporus versicolor): for quality control and data comparability, correct identification of the raw material and traceability of the matrix used (fruiting body, powder, extract, mycelium on substrate) are therefore central.

Mycological classification

Identification data and specifications

Mushroom characteristics

Ecology: it is a highly efficient wood decomposer; it belongs to “white rot” fungi, capable of oxidizing and degrading lignin in addition to cellulose, with a relevant ecological role in forest carbon cycling.

Fruiting body: thin, leathery, often in overlapping shelves; the upper surface shows concentric bands with variable colors (brown, grey, ochre, sometimes with greenish films from algae on older specimens); the lower surface is poroid and generally pale.

Spores: the spore print is typically light; in morphological control this is useful information, but in the supply chain confirmation may require more robust approaches (especially when the material is powdered or extracted).

Part used: in practical use and on the market, dried fruiting body, powders, and extracts are most common. These matrices are not equivalent: a PSP/PSK-standardized extract is not the same as whole powder, and mycelium on substrate can show profiles that differ from the fruiting body.

Chemical composition and structure

Composition depends on strain, substrate, developmental stage, and process. From a functional and quality-control perspective, the most relevant classes include cell-wall polysaccharides and polysaccharide–protein complexes.

Polysaccharides: β-glucans with a β-(1→3) backbone and β-(1→6) branching are frequently reported, with heterogeneity linked to fraction and extraction method. Analytically, β-glucan measurement requires consistent, comparable methods, because different procedures can produce different results.

Polysaccharopeptides and polysaccharide–protein: two preparation families are central in applied literature, PSP (polysaccharopeptide) and PSK (polysaccharide-K, also known as “krestin”). These are complexes in which a polysaccharide fraction is associated with protein/peptide components; composition and molecular weight may vary depending on the industrial process.

Proteins and peptides: beyond PSP/PSK, fungal proteins and peptides occur across fractions; in commercial practice, however, the most “actionable” markers remain PSP/PSK and the polysaccharide profile.

Oxidative enzymes: as a lignicolous polypore, it expresses enzymes (e.g., laccases and peroxidases) involved in wood degradation. In food contexts these are not typically treated as reference “actives,” but they matter for understanding ecology and metabolic variability.

Other molecules: modern reviews also discuss phenolics and minor secondary metabolites, generally more useful for fingerprinting and characterization than for routine standardization, unless specifically chosen by the producer.

Uses and benefits

Traditional use: in Asia it is also known as “yun zhi” and has historically been used in decoctions or traditional preparations, more as a component of formulations than as a direct food (the fruiting body is leathery and not well suited to table-mushroom consumption).

Modern use (supplements): the market includes powders and extracts presented for general wellness and immune support. The strength of evidence depends critically on matrix, dose, duration, population, and especially standardization (PSP/PSK or β-glucans with declared analytical methods).

Regulated clinical context: PSK has historically been used in some countries as an adjunct in oncology protocols; this point, while relevant, is not automatically transferable to any non-standardized supplement that is not regulated as a medicine.

Applications

Dietary supplements: capsules/powders of fruiting body, predominantly aqueous extracts (more oriented to hydrophilic fractions), and preparations declared as standardized in terms of PSP/PSK (when actually controlled). In multi-mushroom products, the true percentage of T. versicolor and the presence of verifiable markers become decisive.

Beverages and preparations: teas/decoctions and powdered blends; actual extraction depends on particle size, time, and temperature, and is not equivalent to a concentrated industrial extract.

Research and quality control: species identification (morphology and, if needed, genetic markers), verification of the declared matrix, titrations (β-glucans, PSP/PSK when declared), and contaminant control (microbiology, metals, residues), with particular attention to concentrated products.

Cultivation

Substrates: it grows on hardwood; in cultivation it can be produced on logs or on sawdust-based blocks from hardwoods, sometimes with supplements to improve colonization and yield.

Indicative parameters: fruiting is managed through humidity, aeration, and temperature; variability among strains and facilities affects yield and the quality of harvested material.

Product variability: strain, substrate, and process can create marked differences between lots, especially when moving from fruiting body to extracts. For this reason, comparability requires technical specifications and declared analytical methods.

Environmental and safety considerations

Allergens and tolerability: as an oral preparation it is often described as well tolerated; clinical studies and observations on extracts mainly report mild, transient adverse events (gastrointestinal discomfort, non-specific symptoms). In practical use, it is prudent to introduce doses gradually and discontinue if reactions occur.

Interactions and prudent use: for concentrated extracts, caution is reasonable in individuals on immunomodulatory therapies or with autoimmune conditions, and in complex therapeutic regimens in general, because product variability and matrix non-equivalence make individual response hard to predict.

Pregnancy and breastfeeding: in the absence of robust safety data for standardized extracts in these populations, it is prudent to avoid supplemental use and limit to any appropriate traditional dietary uses.

Quality and authenticity: the most relevant practical risks are process heterogeneity, lack of standardization (PSP/PSK declared but not verifiable), contaminants, and poor transparency on the matrix (fruiting body vs mycelium on substrate). Supply chains with clear specifications and lot analyses are preferable.

Synonyms

turkey tail (en)

Coriolus versicolor (frequent historical synonym)

Polyporus versicolor (frequent historical synonym)

References__________________________________________________________________________

Shi S, Yin L, Shen X, Dai Y, Wang J, Yin D, Zhang D, Pan X. β-Glucans from Trametes versicolor (L.) Lloyd Is Effective for Prevention of Influenza Virus Infection. Viruses. 2022 Jan 25;14(2):237. doi: 10.3390/v14020237. 

Abstract. Coriolus versicolor (C. versicolor) is a higher fungi or mushroom which is now known by its accepted scientific names as Trametes versicolor (L.) Lloyd. Many studies have shown that β-glucans from C. versicolor have various physiological activities, including activating macrophages to protect against Salmonella infection. However, whether β-glucans have antiviral effects has not been reported. Hence, the objective of this study was to confirm whether β-glucans could boost the immune response to combat influenza virus in mouse and chick models. The results show that β-glucans induced the expression of Dectin-1, costimulatory molecules (CD80/86) and cytokines IL-6, IL-1β, IFN-β and IL-10 in murine bone marrow dendritic cells (BMDCs). In addition, orally administered β-glucans reduced weight loss, mortality and viral titers in the lungs of mice infected with influenza virus and attenuated pathological lung damage caused by the virus in the mice. Orally administered β-glucans improved survival and reduced lung viral titers in chickens infected with H9N2 avian influenza virus. These results suggest that β-glucans have a significant antiviral effect. Therefore, β-glucans could become a potential immunomodulator against influenza virus.

Conceição JCS, Dias HJ, Peralva CMS, Crotti AEM, da Rocha Pita SS, de Oliveira Silva E. Phenolic Compound Biotransformation by Trametes versicolor ATCC 200801 and Molecular Docking Studies. Appl Biochem Biotechnol. 2020 Apr;190(4):1498-1511. doi: 10.1007/s12010-019-03191-y.

Abstract. The filamentous fungus Trametes versicolor is a rich source of laccase (Tvlac). Laccases catalyze reactions that convert substituted phenol substrates into diverse derivatives through aromatic oxidation. We investigated methyl p-coumarate, methyl ferulate, and methyl caffeate biotransformation by Trametes versicolor ATCC 200801. Despite substrate similarity, the biotransformation reactions varied widely. Only methyl p-coumarate was converted into three derivatives. We isolated and identified the chemical structures of such derivatives by NMR and IR analysis. Hydroxylation, methylation, and hydrolysis were the main reactions resulting from the studied biotransformation. We also analyzed the interactions between Tvlac (PDB ID: 1GYC) and the three phenolic substrates by molecular docking simulations. The substituents in the phenol ring influenced substrate conformation and orientation in the Tvlac site. The biotransformation reaction selectivity correlated with the different binding energies to the Tvlac site. Our results demonstrated that docking studies successfully predict the biotransformation of cinnamic acid analogs by T. versicolor.

Winkler M, Winkler CK. Trametes versicolor carboxylate reductase uncovered. Monatsh Chem. 2016;147:575-578. doi: 10.1007/s00706-016-1676-z. 

Abstract: The first carboxylate reductase from Trametes versicolor was identified, cloned, and expressed in Escherichia coli. The enzyme reduces aromatic acids such as benzoic acid and derivatives, cinnamic acid, and 3-phenylpropanoic acid, but also aliphatic acids such as octanoic acid are reduced.

Stenholm Å, Hedeland M, Pettersson CE. Neomycin removal using the white rot fungus Trametes versicolor. J Environ Sci Health A Tox Hazard Subst Environ Eng. 2022;57(6):436-447. doi: 10.1080/10934529.2022.2072644. 

Abstract. The presence of antibiotic resistance genes in wastewater treatment plants (WWTPs), and in river and lake recipients show the need to develop new antibiotic removal strategies. The aminoglycoside antibiotic class is of special concern since the chemical structure of these compounds limits the choices of removal technologies. The experimental design included fungal mediated in vivo and in vitro experiments. The experiments were performed in Erlenmeyer flasks under non-sterile conditions. In the study, the role of the laccase redox mediator 4-hydroxy benzoic acid (HBA) in the removal of neomycin was investigated. The specific objective of the study was to conclude whether it is possible to use the white rot fungus (WRF) Trametes versicolor to biodegrade neomycin. It was shown that it is feasible to remove 34% neomycin in vitro (excluding living fungal cells) by laccase-HBA mediated extracellular biodegradation. In the in vivo experiments, polyurethane foam (PUF) was used as supporting material to immobilize fungal mycelia on. The presence of living fungal cells facilitated a removal of approximately 80% neomycin in the absence of HBA. Using liquid chromatography-high resolution-mass spectrometry, it was possible to tentatively identify oxidation products of neomycin hydrolysates. The results in this study open up the possibility to implement a pretreatment plant (PTP) aimed for neomycin removal.

He Z, Lin J, He Y, Liu S. Polysaccharide-Peptide from Trametes versicolor: The Potential Medicine for Colorectal Cancer Treatment. Biomedicines. 2022 Nov 7;10(11):2841. doi: 10.3390/biomedicines10112841.

Abstract. The incidence and mortality of colorectal cancer have shown an upward trend in the past decade. Therefore, the prevention, diagnosis, and treatment of colorectal cancer still need our continuous attention. Finding compounds with strong anticancer activity and low toxicity is a good strategy for colorectal cancer (CRC) therapy. Trametes versicolor is a traditional Chinese medicinal mushroom with a long history of being used to regulate immunity and prevent cancer. Its extractions were demonstrated with strong cell growth inhibitory activity on human colorectal tumor cells, while the anticancer activity of them is not acted through a direct cytotoxic effect. However, the intricacy and high molecular weight make mechanistic research difficult, which restricts their further application as a medication in clinical cancer treatment. Recent research has discovered a small molecule polysaccharide peptide derived from Trametes versicolor that has a distinct structure after decades of Trametes versicolor investigation. Uncertain molecular weight and a complex composition are problems that have been solved through studies on its structure, and it was demonstrated to have strong anti-proliferation activity on colorectal cancer in vitro and in vivo via interaction with EGFR signaling pathway. It opens up new horizons for research in this field, and these low molecular weight polysaccharide peptides provide a new insight of regulation of colorectal cancer proliferation and have great potential as drugs in the treatment of colorectal cancer.

Standish LJ, Wenner CA, Sweet ES, Bridge C, Nelson A, Martzen M, Novack J, Torkelson C. Trametes versicolor mushroom immune therapy in breast cancer. J Soc Integr Oncol. 2008 Summer;6(3):122-8. 

Abstract. Data from multiple epidemiologic and clinical studies on immune effects of conventional cancer treatment and the clinical benefits of polysaccharide immune therapy suggest that immune function has a role in breast cancer prevention. Immune therapy utilizing the polysaccharide constituents of Trametes versicolor (Tv) as concurrent adjuvant cancer therapy may be warranted as part of a comprehensive cancer treatment and secondary prevention strategy.