Ingredient Guide
Turkey Tail Explained: The Gut and Immune Mushroom
Turkey tail (Trametes versicolor) is one of the most studied medicinal mushrooms. What its polysaccharides do, what a trial in healthy volunteers found, and how it fits into Forage.
Explore Mushroom SupportTurkey Tail on the Label
Exactly how much turkey tail is in our product, straight from the label.
How to use it (label directions): follow the directions on the Forage label. Each bottle holds 30 servings. How this compares with research doses: clinical preparations of PSP and PSK are specific standardized extracts, often given in amounts of several grams a day. Forage contains 150 mg of an 8:1 turkey tail extract as one of seven mushrooms, and the label does not state PSP or beta-glucan content, so the amounts are not directly comparable. Use it as directed on the label.
The Most Studied Woodland Mushroom
Turkey tail (Trametes versicolor, also called Coriolus versicolor) is a thin, fan-shaped mushroom that grows in overlapping layers on dead wood. Its rings of brown, tan and cream look like a turkey's tail feathers, which is how it got its name. In China it has been used for centuries as yun zhi.
What makes turkey tail stand out is the depth of research on its polysaccharides, especially two protein-bound extracts known as PSK and PSP. We include 150 mg of an 8:1 turkey tail extract in Forage, our seven mushroom blend, alongside reishi, chaga, lion's mane and cordyceps.
Tip: Turkey tail is tough and leathery, so it is not eaten as a food mushroom. It is used as a tea or an extract.
How Turkey Tail Works
Polysaccharides That Feed Gut Bacteria
Turkey tail polysaccharides are not broken down by our own digestive enzymes, so they reach the colon intact, where gut bacteria can use them. In a laboratory study with human stool samples, PSP from turkey tail encouraged the same groups of bacteria that well known prebiotics such as FOS support, and changed the pH.
Immune Signaling
A review of the research describes PSP as inducing a largely pro-inflammatory cytokine profile, meaning it switches on immune signaling, and it acts on several types of immune cells. This is why turkey tail is described as immune supporting, although most of this evidence comes from cells, animals and people under medical care.
What Human Studies Found
The Gut Microbiome in Healthy Volunteers
In a randomized trial, 24 healthy volunteers took PSP from turkey tail, the antibiotic amoxicillin, or nothing, and their stool was analyzed repeatedly over 8 weeks. PSP led to clear and consistent microbiome changes consistent with prebiotic activity, while amoxicillin caused disruption that was still present six weeks after it ended. The researchers concluded that PSP acts as a prebiotic in people.
Research in Medical Settings
Most other human research on turkey tail comes from hospitals in Japan and China, where specific standardized extracts such as PSK are used alongside medical treatment. Those results apply to those preparations in that setting, not to a general supplement, so we do not draw claims from them.
The honest summary: turkey tail has more human research than most mushrooms, and a trial in healthy people supports a prebiotic effect on the gut. Its immune effects are well documented in the lab. Forage uses it as one supporting mushroom, not as a stand-alone immune product.
Turkey Tail and Other Forage Mushrooms
Forage combines seven mushrooms. Here is how turkey tail compares with two of its neighbors.
| Feature | Turkey tail | Reishi | Chaga |
|---|---|---|---|
| Grows on | Dead hardwood logs | Hardwood trees and stumps | Living birch trees |
| Key compounds | PSP and PSK polysaccharides | Triterpenes, beta-glucans | Melanins, phenolics, triterpenoids |
| Best studied for | Gut microbiome, immune signaling | Sleep, stress, immune support | Antioxidant activity (lab only) |
| In Forage | 150 mg 8:1 extract | 200 mg 8:1 extract | 150 mg 8:1 extract |
Dosage, Timing, and Stacking
Amounts Used in Studies
Clinical PSP and PSK preparations are standardized extracts often given at several grams a day. Forage provides 150 mg of an 8:1 turkey tail extract per serving as part of a wider blend, so follow the label.
Timing
Follow the directions on the Forage label. Consistent daily use matters more than the time of day for a gut-focused ingredient.
Stacking
Turkey tail already sits with six other mushrooms, Himalayan shilajit and ashwagandha root extract in Forage. A diet rich in fiber and fermented foods supports the same gut bacteria. For more on how mushroom extracts are made, see mushroom extracts vs powders.
Safety and Side Effects
Turkey tail is generally well tolerated. Reported side effects are mostly digestive, such as gas, bloating or loose stools.
Points Worth Knowing
- Immune medication: because turkey tail activates immune signaling, people taking immune-suppressing medication should ask their clinician first.
- Medical treatment: anyone receiving treatment for a serious illness should check with their care team before adding any mushroom supplement.
- Allergy: avoid it if you are allergic to mushrooms or molds.
Who should be cautious: speak with a qualified healthcare professional before using turkey tail if you are pregnant or nursing, take immune-suppressing or other regular medication, are receiving medical treatment, or have a mushroom allergy.
Key Takeaways
- Turkey tail (Trametes versicolor) is a woodland mushroom rich in PSP and PSK polysaccharides.
- In a trial in healthy volunteers, PSP shifted the gut microbiome in a prebiotic-like way.
- Laboratory research shows it switches on immune signaling.
- Forage contains 150 mg of an 8:1 turkey tail extract per serving, with six other mushrooms.
- Check with a clinician if you take immune-suppressing medication or are receiving medical treatment.
Feed the Gut, Support the System.
Turkey tail works quietly, as food for the bacteria that line your gut and as a signal to immune cells. It earns its place in Forage as a well studied supporting mushroom.
Turkey Tail FAQ
What does turkey tail mushroom do?
Turkey tail (Trametes versicolor) contains polysaccharides such as PSP and PSK that interact with the immune system and act as food for gut bacteria. In a randomized trial in healthy volunteers, PSP from turkey tail changed the gut microbiome in a way consistent with a prebiotic. Laboratory research shows it activates immune signaling.
Is it safe to take turkey tail every day?
Turkey tail has a long history of use and is generally well tolerated. Reported side effects are mostly digestive. People who take medication that affects the immune system, are pregnant or nursing, or have a mushroom allergy should check with a clinician first.
Who should not take turkey tail?
Speak with a clinician before using turkey tail if you take immune-suppressing medication, are receiving medical treatment for a serious illness, are pregnant or nursing, or are allergic to mushrooms.
What are PSK and PSP?
PSK (polysaccharide K, also called krestin) and PSP (polysaccharopeptide) are protein-bound polysaccharides extracted from turkey tail. They are the most studied compounds in the mushroom, mostly in Japan and China.
How much turkey tail is in Forage?
Each 2-capsule serving of Forage contains 150 mg of an 8:1 turkey tail extract, alongside lion's mane, cordyceps, reishi, chaga, maitake, shiitake, Himalayan shilajit and ashwagandha root extract. The label does not state beta-glucan or PSP content.
Is turkey tail hard on the liver?
There is little published evidence linking turkey tail to liver problems. As with any supplement, stop taking it and speak with a clinician if you notice unusual tiredness, dark urine or yellowing of the skin.
More on Turkey Tail
Sources
- Pallav K, et al. Effects of polysaccharopeptide from Trametes versicolor and amoxicillin on the gut microbiome of healthy volunteers: a randomized clinical trial. Gut Microbes, 2014. PubMed 25006989
- Yu ZT, et al. Trametes versicolor extract modifies human fecal microbiota composition in vitro. Plant Foods for Human Nutrition, 2013. PubMed 23435630
- Saleh MH, et al. Immunomodulatory properties of Coriolus versicolor: the role of polysaccharopeptide. Frontiers in Immunology, 2017. PubMed 28932226
- Ng TB. A review of research on the protein-bound polysaccharide (polysaccharopeptide, PSP) from the mushroom Coriolus versicolor (Basidiomycetes: Polyporaceae). General Pharmacology, 1998. PubMed 9457474
These statements have not been evaluated by the Food and Drug Administration. This information is not intended to diagnose, treat, cure, or prevent any disease. Nothing here is medical advice. If you are pregnant, nursing, taking medication (especially immune-suppressing medication), receiving medical treatment, or managing a health condition, consult a qualified healthcare professional before use.