Evidence-based·Last reviewed May 30, 2026·How we grade evidence

Coriolus mushroom

Botanical

Useful mainly for people in cancer care using PSK/PSP alongside conventional treatment under oncology supervision.

Quick decision guide

May help most

people in cancer care using PSK/PSP alongside conventional treatment under oncology supervision

Common dosing range

1–3 g/day extract; PSK studied at 3 g/day

When to expect effects

Weeks to months

Watch out for

Coordinate with your oncology team; theoretical concern with immunosuppressants

What is it

Coriolus versicolor (also called Trametes versicolor or turkey tail) is a common shelf fungus found on dead hardwood worldwide. Two standardized polysaccharide fractions derived from it, polysaccharide-K (PSK, Krestin) and polysaccharide-peptide (PSP), have been investigated extensively as cancer adjuvants, particularly in Japan and China.

Is it worth it for you?

Use this as a quick fit check, not a diagnosis.

Worth considering if…

You are receiving conventional treatment for gastric or colorectal cancer and your oncologist supports adjunct PSK
You want an immune-oriented adjunct with a long safety record

Probably skip if…

You expect it to treat cancer on its own
You take immunosuppressants or are an organ-transplant recipient
You are looking for proven general immune or antiviral benefits

Evidence at a glance

cancer adjuvant therapy

Good Evidence
Effect
Modest survival benefit in some studies
Best fit
patients with resected gastric or colorectal cancer receiving chemotherapy
Time
Months

Evidence for 1 use

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

cancer adjuvant therapy

Disease adjunct
Good Evidence

PSK has been used in Japan since the 1970s as an adjunct to chemotherapy and radiation, and meta-analyses of Asian trials suggest improvements in survival and quality of life in certain gastric, colorectal, and lung cancers. The benefit is as an addition to conventional treatment, not a replacement, and much of the evidence comes from older studies in specific patient groups. It should only be used within an oncology care plan.

Effect size
Modest survival benefit in some studies
Time to effect
Months
Best fit
patients with resected gastric or colorectal cancer receiving chemotherapy
Less likely
people seeking a standalone cancer treatment

Bottom line: Reasonable evidence as a supervised chemo adjunct in specific cancers — never as monotherapy.

Evidence is mixed

Positive trials are concentrated in Japanese and Chinese settings with older methodology, so generalizability to other populations and modern regimens is uncertain.

SourceEliza et al., 2012 — PubMed· conflictingSakamoto et al., 2006 — PMC· conflicting
SourceEliza et al., 2012 — PubMedSakamoto et al., 2006 — PMC

How it works

Turkey tail's primary bioactives are protein-bound polysaccharides, especially PSK and PSP. These compounds modulate the immune system by interacting with pattern-recognition receptors on macrophages, natural killer cells, and dendritic cells. They stimulate cytokine production, including interferon-gamma and interleukins involved in antitumor immunity. In oncology, PSK has been used in Japan since the 1970s as an adjunct to chemotherapy and radiation, with extensive clinical research suggesting improvements in survival, immune parameters, and quality of life in certain gastric, colorectal, and lung cancers. The proposed mechanism involves restoration of immune function suppressed by cancer treatment. Research suggests turkey tail polysaccharides may also have prebiotic effects, influencing gut microbiota composition. This has prompted interest in gut health applications. Antioxidant and anti-inflammatory activities have been demonstrated in preclinical models but have less robust clinical support.

How to take it

1. Typical dose
1–3 g/day of turkey tail extract (or 500–1,000 mg standardized PSP/PSK)
2. Higher studied dose
3 g/day PSK in cancer adjuvant trials
3. Timing
Any time of day, split into 2–3 portions
4. With food
With or without food
5. Split dosing
2–3 divided doses
6. How long to try
Weeks to months for measurable immune effects

What to track

Tolerance / GI symptoms
Energy and quality of life
Any oncology-monitored immune parameters

3 commercial forms

Compare the main delivery options and what they’re best suited for.

PSK (polysaccharide-K, Krestin)

Best-studied form, used clinically in Japan. Difficult to obtain as a regulated drug outside Japan.

Standardized prescription product in Japan; oral absorption of polysaccharides is partial.

PSP (polysaccharide-peptide)

Closely related to PSK; both have shown clinical immune-modulating effects.

Standardized fraction studied in Chinese cancer trials.

Whole turkey tail extract

The most common form in over-the-counter supplements. Quality varies; look for products standardized to beta-glucan content.

Hot water extracts capture beta-glucans; some products use dual extraction.

Safety

Know the common side effects, key cautions, and who should avoid it.

Common side effects

Mild GI upsetDarkening of fingernailsOccasional fatigue

Who should avoid it

  • Pregnant or breastfeeding people
  • People with mushroom allergies
  • People on immunosuppressants without medical advice

Pregnancy & breastfeeding

Avoid in pregnancy and breastfeeding due to insufficient safety data.

Interactions

ImmunosuppressantsModerate

Immune modulation may oppose intended suppression in transplant or autoimmune patients

Antiplatelet drugsMinor

Limited evidence of minor antiplatelet activity

Choosing a product

What to look for on the label — and what to be skeptical of.

Look for…

Standardized PSK or PSP content
Fruiting-body or clearly stated extract source
Third-party testing for contaminants

Be skeptical of…

"Cures cancer"
Replaces chemotherapy or radiation
Generic "boosts immunity" without strain/fraction data

Frequently asked questions

What is the difference between turkey tail and coriolus?⌄

They are the same mushroom. Trametes versicolor, also called Coriolus versicolor, is commonly known as turkey tail because of its colorful banded appearance.

Can turkey tail treat cancer?⌄

Turkey tail extracts (especially PSK) have been used as an adjunct to conventional cancer treatment with evidence for improved survival in certain cancers. They are not a substitute for standard cancer care.

How long should I take turkey tail?⌄

In clinical trials, durations of several months to several years have been used. For general immune support, several weeks to months of consistent use is typical.

Is turkey tail safe with chemotherapy?⌄

PSK has been used safely alongside chemotherapy in Japanese clinical practice for decades. Always coordinate with your oncology team before starting any supplement during cancer treatment.

What does turkey tail look like?⌄

It is a shelf fungus with concentric bands of varying colors (brown, tan, blue, gray, orange), resembling the spread tail feathers of a turkey. Found on dead hardwood worldwide.

References by claim

cancer adjuvant therapy

Eliza et al., 2012 — PubMed (2012) link

Sakamoto et al., 2006 — PMC (2006) link

Track Coriolus mushroom with Pilora

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Evidence-based·Last reviewed May 30, 2026·Evidence current as of May 30, 2026·How we grade evidence

Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.