Supplement: Heilpilze

What They Are

Medicinal mushrooms are a group of fungi sold as capsules, powders and extracts for the immune system, energy, calm and cancer support. Four are grouped together here. Lion's mane is the fifth in the popular stack, and its cognition research sits on a separate page. The four here are reishi, cordyceps, turkey tail and chaga.

Reishi (Ganoderma lucidum, Ling Zhi in Chinese medicine) is the classical tonic mushroom, dried and simmered for centuries. Cordyceps (Dong Chong Xia Cao, the caterpillar fungus, now mostly the cultivated strain Cs-4 or the species Cordyceps militaris) is the traditional lung and kidney tonic. Turkey tail (Trametes versicolor, Yun Zhi) is a bracket fungus that became the source of two licensed cancer drugs in Asia. Chaga (Inonotus obliquus) is a birch fungus from the northern forests, and the most recent of the four to become popular.

What The Evidence Shows

Turkey tail has the strongest evidence. Its purified polysaccharide PSK has been used in Japan since the 1980s as an addition to cancer chemotherapy. A meta-analysis of eight randomized trials and 8,009 patients found that adding PSK after surgery for gastric cancer improved survival, with a hazard ratio of 0.88 (Oba 2007). A later network meta-analysis of 23 trials and more than 10,000 patients with gastrointestinal cancers found the same survival benefit (Ma 2017). The gain concentrated in gastric and colorectal cancer, where PSK was combined with chemotherapy. A systematic review of turkey tail for lung cancer found a favorable signal too, though it leaned more on non-randomized studies (Fritz 2015).

PSK is not a supplement. In Japan it is a licensed prescription drug called Krestin, made by the Kureha Corporation and approved there since 1977. The survival trials come almost entirely from that home market. What is sold as a turkey tail capsule elsewhere is a different, unstandardized product.

A small phase 1 trial in women recovering from breast cancer radiotherapy found that turkey tail raised immune cell counts and natural killer cell activity (Torkelson 2012). That is an early immune marker; survival was not measured.

Turkey tail's survival data are for an extract added to chemotherapy under medical care, never a replacement for cancer treatment.

Cordyceps has small, mixed exercise data. A 12-week trial of the cultivated Cs-4 strain in 20 healthy older adults improved metabolic and ventilatory thresholds, markers of aerobic capacity (Chen 2010). VO2max itself did not move. A separate three-week trial gave 28 younger adults a mushroom blend containing Cordyceps militaris. It improved VO2max and time to exhaustion after three weeks, but not after one week (Hirsch 2017). Because it was a blend, cordyceps cannot be credited alone. Across both, the edge in exercise tolerance is possible but modest, from studies that do not fully agree.

Reishi has a weak cancer signal and a thin sleep case. The Cochrane review found that patients who added reishi to chemotherapy or radiotherapy were more likely to respond to treatment and reported better quality of life (Jin 2016). It also raised some immune measures. But the trials were graded low quality, so the review treated reishi as a possible adjunct only. The traditional use for sleep and calm is long. But the modern trials for those uses are few and small, so the sleep claim rests mainly on that traditional use.

Chaga is the least established of the four. Its anticancer and antioxidant activity has shown up in cell and animal studies. No human trials have tested whether those lab effects hold up in people, so it stays unconfirmed.

The Research & Studies

Everything here is based on the research we have collected and checked, sorted into groups and ordered with the strongest evidence first. Click any claim to open the studies behind it.

Cancer Risk And Outcome

Turkey tail PSK added to chemotherapy after gastric cancer surgery improved survival, hazard ratio 0.88 across 8,009 patientsModerate

In plain terms

When a turkey tail mushroom extract was added to chemotherapy after stomach cancer surgery, slightly more people were still alive later than with chemotherapy alone.

In detail

Pooling eight randomized trials of 8,009 patients, adding the turkey tail polysaccharide PSK to chemotherapy after curative gastric cancer surgery improved overall survival with a hazard ratio of 0.88 (95% CI 0.79 to 0.98). A later network meta-analysis of 23 gastrointestinal-cancer trials and more than 10,000 patients found the same direction, strongest in gastric and colorectal cancer when PSK was combined with chemotherapy. Measured in: Adults with resected gastric and other gastrointestinal cancers, mostly in Japanese trials. The benefit is for a standardized extract added to chemotherapy, mostly in Asian trials, not for turkey tail taken instead of cancer treatment, and the pooled trials vary in method and era.

Who this may not transfer to:Trials enrolled both men and women with gastrointestinal cancer; PSK acts through immune signaling that is not sex-specific, so the survival direction is expected to hold across sexes.

The studies · 2

Oba et al., efficacy of adjuvant immunochemotherapy with polysaccharide K for patients with curative resections of gastric cancer · Cancer Immunol Immunother 2007

Ma et al., can polysaccharide K improve therapeutic efficacy and safety in gastrointestinal cancer, systematic review and network meta-analysis · Oncotarget 2017

Turkey tail PSK looked favorable for survival and symptoms in lung cancer across 28 studies, mostly weaker designsEmerging

In plain terms

In lung cancer, adding turkey tail extract looked helpful for survival and for symptoms like fatigue, though many of the studies were weaker in design.

In detail

A systematic review of 28 studies of PSK and other Trametes versicolor extracts for lung cancer found favorable effects on survival, immune parameters, performance status and tumor-related symptoms such as fatigue and anorexia, alongside preclinical support for immunomodulation. Measured in: Lung cancer patients across randomized and non-randomized trials. The favorable signal leaned heavily on non-randomized controlled trials and preclinical work, not on large randomized trials, so it is weaker than the gastric cancer data.

Who this may not transfer to:Lung cancer trials included both sexes; the immunomodulatory mechanism is not sex-specific, so the signal should transfer across sexes.

The study · 1

Fritz et al., polysaccharide K and Coriolus versicolor extracts for lung cancer, a systematic review · Integr Cancer Ther 2015

Reishi added to chemotherapy or radiotherapy improved tumor response and quality of life, but on low-quality trialsEmerging

In plain terms

Adding reishi to chemotherapy or radiotherapy helped some cancer patients respond better and feel better, but the studies behind that were weak.

In detail

The Cochrane review found that cancer patients who took Ganoderma lucidum alongside chemotherapy or radiotherapy were more likely to respond to treatment than with conventional treatment alone, showed enhanced immune measures with significant rises in CD3, CD4 and CD8 T-cell percentages and only a marginal rise in natural killer cell activity, and reported better quality of life, but the trials were of low methodological quality. Measured in: Cancer patients across five randomized trials of varied cancers. The review graded the evidence as low quality and concluded reishi could be a possible adjunct, not a first-line treatment on its own.

Who this may not transfer to:The pooled trials covered varied cancers in both sexes; the immune and quality-of-life effects are not thought to be sex-specific.

The study · 1

Jin et al., Ganoderma lucidum (Reishi mushroom) for cancer treatment · Cochrane Database Syst Rev 2016

How it works

Beta-glucans bind dectin-1 and complement receptors to switch on immune cellsModerate

In plain terms

The fiber in mushroom cell walls fits receptors on immune cells and switches them on, which is the proposed reason these mushrooms affect the immune system.

In detail

Beta-glucans from mushroom cell walls, including the protein-bound PSK from turkey tail, bind receptors such as dectin-1 and complement receptor 3 on macrophages, natural killer cells and dendritic cells, shifting them toward activity and providing the mechanistic basis for the immune and anticancer effects studied in these mushrooms. This is a laboratory mechanism established mainly in cell and animal studies, and a plausible mechanism is a starting point, not proof of a benefit in people.

Who this may not transfer to:This is a cell and animal mechanism not tied to sex, so it applies to men and women alike.

The study · 1

Chan et al., the effects of beta-glucan on human immune and cancer cells · J Hematol Oncol 2009

Immune Function

Turkey tail up to 9 grams a day raised immune cell counts and natural killer activity in a phase 1 breast cancer trialPreliminary

In plain terms

In a small early trial, women recovering from breast cancer treatment who took turkey tail showed signs of a stronger immune response.

In detail

In a phase 1 dose-escalation trial, women recovering from breast cancer radiotherapy who took up to 9 grams a day of a Trametes versicolor preparation for six weeks showed trends toward higher lymphocyte counts and increased natural killer cell activity, and the preparation was well tolerated. Measured in: Nine to eleven women recovering from breast cancer radiotherapy. This was a safety and dose-finding study of nine completing participants with no control group, measuring immune markers, not any survival or clinical outcome.

Who this may not transfer to:Measured in women with breast cancer (the phase-1 trial population); the immune-cell and NK-activity response to turkey tail beta-glucans is not sex-specific in mechanism, so a similar direction is plausible in men, but it has not been tested directly.

The study · 1

Torkelson et al., phase 1 clinical trial of Trametes versicolor in women with breast cancer · ISRN Oncol 2012

Cardiorespiratory Fitness

Cordyceps Cs-4 raised aerobic thresholds 10.5% in 20 older adults, with no change in VO2maxPreliminary

In plain terms

Older adults who took cordyceps for three months could exercise a bit harder before tiring, though their peak oxygen use did not improve.

In detail

In a 12-week double-blind placebo-controlled trial of 20 healthy adults aged 50 to 75, cordyceps Cs-4 at 1 gram a day raised the metabolic threshold by 10.5% and the ventilatory threshold by 8.5%, both markers of aerobic capacity, while VO2max did not change in either group. Measured in: Twenty healthy adults aged 50 to 75. A pilot trial of only 20 people in which the main measure of fitness, VO2max, did not change, so the effect is small and needs larger confirmation.

Who this may not transfer to:The pilot enrolled both men and women aged 50 to 75; aerobic-threshold effects are not sex-specific in mechanism, though the sample was too small to test sex differences.

The study · 1

Chen et al., effect of Cs-4 (Cordyceps sinensis) on exercise performance in healthy older subjects, a double-blind placebo-controlled trial · J Altern Complement Med 2010

A cordyceps mushroom blend improved VO2max and endurance after three weeks, but not after one weekPreliminary

In plain terms

A mushroom blend with cordyceps let people exercise longer and use more oxygen after three weeks, but not after just one week.

In detail

In a randomized placebo-controlled trial of 28 adults, a 4 gram a day mushroom blend containing Cordyceps militaris improved VO2max and time to exhaustion after three weeks of supplementation, with no significant change after one week. Measured in: Twenty-eight healthy adults, mean age 23. The supplement was a multi-mushroom blend, not cordyceps alone, so the effect cannot be attributed to cordyceps by itself, and only ten of the twenty-eight participants continued into the three-week phase that produced the benefit, so the sample behind that result was very small.

Who this may not transfer to:Young adults of both sexes were studied; the exercise-tolerance effect is not thought to be sex-specific, but the trial was small.

The study · 1

Hirsch et al., Cordyceps militaris improves tolerance to high-intensity exercise after acute and chronic supplementation · J Diet Suppl 2017

How They Work

Anatomy of the Practice

1The shared ingredient: beta-glucan

The compound the four have in common is beta-glucan, a fiber in the mushroom cell wall. All four carry it, in different amounts, and it is the basis of every immune claim made for them.

2From gut to immune system

Beta-glucans are not digested like ordinary starch. They pass to the gut-associated immune tissue and the immune cells lining the gut. Much of the signaling is thought to begin there. This route is worked out mostly in cells and animals, so it shows how the effect could happen without proving a clinical result.

3Where the four diverge

Turkey tail's PSK was purified and tested against cancer, so its data reach a survival outcome. Cordyceps was studied for oxygen use in exercise, reishi for immune and quality-of-life measures, chaga mostly in animals.

The immune mechanism is the one behind most of the marketing. Beta-glucans from the mushroom cell wall bind receptors on immune cells such as macrophages, natural killer cells and dendritic cells, shifting them toward activity. Turkey tail PSK, the most studied preparation, is a protein-bound beta-glucan (Chan 2009). The working theory for its cancer results is that it helps the immune system recognize and act against tumor cells, while chemotherapy acts separately. That mechanism is established in the laboratory. Only turkey tail has been measured to a clinical outcome; the other three have no such clinical proof.

What is actually in the product varies across the four species. The active material sits in the fruiting body, the mushroom itself, and in cultivated mycelium, the branching network usually grown on grain. Many cheaper supplements are mycelium dried together with the grain it grew on. That can leave a capsule that is largely starch, with little mushroom and little beta-glucan.

Choosing and Using Them

Ways to Do It

Match the mushroom to the goal, especially if you take a blood thinner or an immune-suppressing drug. For a healthy person, food-grade mushrooms and a decent diet come before any capsule. The higher rungs are specific and, in the cancer case, belong with an oncologist.

1

Eat culinary mushrooms as foodFreeEasy

The fair starting point for most people. Shiitake, maitake, oyster and enoki mushrooms are food, and carry the same beta-glucan family. This will not deliver the concentrated turkey tail dose used in cancer trials. It is a sound, low-cost way to get the fiber and eat well.

2

A fruiting-body extract that states its beta-glucan content$Easy

If you want a supplement, the practical buy is a fruiting-body extract from a brand that gives a measured beta-glucan percentage, not just a milligram weight of powder. That number is the closest thing to a quality signal on the shelf. Reishi and cordyceps are the usual choices for general immune and energy support at this rung.

3

Give it eight to twelve weeks, then judge it$Easy

The exercise and immune signals in the trials built over weeks. So take it daily for eight to twelve weeks, and judge it against how you felt before you started.

4

Third-party tested for heavy metals$$Easy

A product with independent heavy-metal testing and a stated result is the most expensive quality check here. It is the one line on the label that tells you what came out of the ground with the mushroom.

5

Turkey tail extract alongside cancer treatment, with an oncologist$$ to $$$Moderate

This is the one mushroom with human outcome data. Its studied use is a standardized extract taken alongside chemotherapy, a decision to make with your oncologist and weighed against interactions and the specifics of the cancer.

Go Deeper

• Lion's mane: the fifth mushroom in the popular stack, covered on its own page for its nerve-growth compounds and the small human trials in memory and mood.
• Placebo and its power: why a benefit that runs partly through expectation is still a measurable effect, useful for reading small, subjective supplement trials.
• How we grade evidence: what emerging and preliminary mean, and why a strong laboratory mechanism and a handful of small human trials are graded apart.

The Chinese Medicine View

Cautions For This Practice

Extra restraint

Everything to be aware of is here, in one place. This practice suits most healthy people; a few situations call for real care.

Immune-suppressing drugs and autoimmune conditions

These mushrooms are taken partly to stimulate the immune system. That is the concern for anyone on an immunosuppressant drug, including after an organ transplant, or for an autoimmune condition. Adding an immune stimulant could in theory work against the medication or stir an autoimmune process. If you take such a drug or have an autoimmune condition, clear it with your clinician before starting.

Blood thinners, bleeding and surgery

Reishi in particular has been reported to have a mild blood-thinning action, and there are case reports of bleeding at high doses. If you take an anticoagulant or antiplatelet drug, or have surgery coming up, tell your clinician you are taking a mushroom supplement. It is simple to pause it beforehand.

Discuss with your oncologist, never substitute

Turkey tail's survival data are for an extract added to chemotherapy under medical care, never a replacement for cancer treatment. Some mushroom compounds could also interact with chemotherapy or affect the immune system in ways that matter during treatment. Anyone in cancer care should raise any mushroom supplement with their oncologist before starting it.

Product quality and what is in the capsule

Mushroom supplements are loosely regulated and vary a great deal. They also concentrate heavy metals from where they grow, and chaga in particular is high in oxalate, a concern for anyone prone to kidney stones.

Pregnancy, breastfeeding and allergy

There is not enough safety data on concentrated mushroom supplements in pregnancy or breastfeeding to judge them. The cautious course is to stay with culinary mushrooms as food. As with any mushroom, allergic reactions are possible, so start with a small amount the first time and stop if you develop a rash, itching or any difficulty breathing.

Start slow, be smart, read the research, and consult a professional if you have any concerns. This is here to inform your choice, not make it for you.

Common Questions

Do medicinal mushrooms really boost your immune system?

They engage it, which is not the same as a benefit you can feel. Whether that activation fends off illness in a healthy person has not been tested the way the cancer work was. The mechanism is real for all four; the everyday payoff for a well person is unconfirmed.