Herb & supplement monograph

Turkey Tail Mushroom Drug Interactions, Uses, Effectiveness, Safety & More

Medically reviewed by Dr. Brian Staiger, PharmD, BCPS ·Updated July 2026

What is this page for?

First and foremost: how Turkey Tail Mushroom interacts with medications. The heart of this page is the interaction list — every drug Turkey Tail Mushroom is known to interact with, and how serious each one is.

But these pages have grown well beyond that into a full monograph — what Turkey Tail Mushroom is, what people use it for and how strong the evidence is, its safety and side effects, and answers to the questions we’re asked most — written and reviewed by the clinical staff at HelloPharmacist. It’s educational information from our licensed clinical databases, not medical advice, and we don’t sell or endorse products. Our editorial policy

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Turkey Tail Mushroom Drug Interactions: The Bottom Line

From the HelloPharmacist Editorial Team · Updated August 2026

Based on the available evidence, the overall risk of a clinically significant Turkey Tail Mushroom drug interaction appears low for most people. None of the listed interactions are rated major, more than half are minor, and every one rests on animal or lab research rather than confirmed effects in humans.

Interactions deserving the most attention

The combinations most worth watching involve two cancer treatments. In animal studies, a turkey tail component raised levels of cyclophosphamide in the body, which could strengthen both its effects and its side effects, and it markedly slowed the absorption of tamoxifen. Animal research also hints that turkey tail may lower blood sugar, so people taking diabetes medications should keep an eye out for signs of low blood sugar. None of these effects has been confirmed in people, but the narrow margins involved make caution sensible.

What the rest of the list means

The long list of moderate and minor interactions largely reflects theory, not observed harm. Most entries stem from lab findings that a turkey tail component might affect an enzyme the body uses to clear certain medications, and that predicted effect has not been reported in humans. A long list, in this case, mostly signals possibilities researchers are still testing.

Check your medications against Turkey Tail Mushroom

Based on HelloPharmacist’s Turkey Tail Mushroom interaction data and reviewed under our editorial standards.

Interaction report

Drugs that interact with Turkey Tail Mushroom

188 medications have a known interaction with Turkey Tail Mushroom, graded by severity. Select any drug for the full evidence-based detail.

Don’t want to scroll the list? Just ask.

Tell us the medications you take and we’ll check each one against Turkey Tail Mushroom using our pharmacist-reviewed interaction data.

AI summaries are generated from our Turkey Tail Mushroom interaction data for education only — always confirm with your pharmacist. How we use AI

2,830 drugs

Read The List Like a Pharmacist

What Severity, Likelihood & Evidence Mean

Severity — How Serious It Can Be

Major. Clinically significant; generally best avoided, or used only under direct professional supervision.
Moderate. May need monitoring, a dose adjustment, or separating the times you take each one.
Minor. Generally not clinically significant, but still worth noting and mentioning to your pharmacist.
No known interaction. Checked against our sources with nothing documented — not the same as proven safety.

Likelihood — How Well It’s Documented

Likely. Well-controlled human studies have demonstrated the likely existence of this interaction
Probable. Interaction has not been documented in well-controlled studies, however, the interaction has been demonstrated in some small human studies or in controlled animal studies in conjunction with multiple case reports.
Possible. Interaction has been documented in animal or in lab research, or the interaction has been documented in humans but is limited to case reports or conflicting clinical research exists
Unlikely. Interaction has been demonstrated in animal or in lab research but has been shown not to occur in humans.

Where This Data Comes From

Interaction records are evidence-graded and sourced from the Natural Medicines database (TRC Healthcare), the same reference used by pharmacists and hospitals.
Each drug listed above links to the full report for that exact Turkey Tail Mushroom combination — clinical detail, likelihood, evidence level, and citations.
Content is reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

The big picture

The kinds of drugs Turkey Tail Mushroom affects

Every type of medication (drug category) Turkey Tail Mushroom is known to interact with. Open any category for the detail — or search your exact drug in the checker above.

All 4 drug categories Turkey Tail Mushroom interacts with

Antidiabetes DrugsCyclophosphamideTamoxifen (nolvadex)Cytochrome P450 2c9 (cyp2c9) Substrates

Antidiabetes Drugs

Theoretically, taking turkey tail mushroom with antidiabetes drugs might increase the risk of hypoglycemia.
Animal research suggests that turkey tail mushroom and a polysaccharide component can have hypoglycemic effects.

Likelihood Possible Evidence D

Cyclophosphamide

Theoretically, the polysaccharide peptide (PSP) component of turkey tail mushroom might increase exposure to cyclophosphamide.
Some animal research shows that the PSP component of turkey tail mushroom can increase the area under the concentration-time curve (AUC) of cyclophosphamide by 44% to 50% and the half-life by 34% to 43%. This interaction could potentially increase the effects and adverse effects of cyclophosphamide. However, it is not known whether PSP affects the levels of the active metabolites of cyclophosphamide that are responsible for its clinical activity.

Likelihood Possible Evidence D

Tamoxifen (Nolvadex)

Theoretically, the polysaccharide peptide (PSP) component of turkey tail mushroom might interfere with the absorption of tamoxifen.
Animal research suggests that PSP increases the time to reach maximum concentration of a single dose of tamoxifen by about 9.5 hours, or 228%. When repeated doses of tamoxifen were given, the time to reach maximum concentration was increased by about 5.6 hours, or 93%. However, PSP did not affect the maximum concentration or the area under the curve of tamoxifen.

Likelihood Possible Evidence D

Cytochrome P450 2C9 (Cyp2C9) Substrates

Theoretically, the polysaccharide peptide (PSP) component of turkey tail mushroom might inhibit CYP2C9.
Laboratory research suggests that the PSP component of turkey tail mushroom dose-dependently inhibits CYP2C9. Theoretically, taking PSP with drugs metabolized by CYP2C9 might increase drug levels and the risk of adverse effects. However, this has not been reported in humans.

Likelihood Possible Evidence D

Monograph

Turkey Tail Mushroom: Uses, Safety & Side Effects

Medically reviewed by Dr. Brian Staiger, PharmD, BCPS · Reviewed July 2026 ·

The bottom line

Turkey tail is a woodland mushroom rich in polysaccharides like beta-glucans, and it is mainly used to support the immune system. Some of its purified extracts (PSK and PSP) have been studied as add-on treatments alongside conventional cancer therapy in Asia, but evidence for everyday supplement use is limited. It is generally well tolerated, but talk to your pharmacist or doctor before using it, especially if you have a health condition or take other medicines.

Scientific name: Trametes versicolor
Family: Polyporaceae
Part used: Fruiting body and mycelium (and extracts such as PSK and PSP)
Common forms: Capsules, tablets, powders, teas, tinctures, standardized extracts (PSK/PSP)

People commonly use it for

Immune support
Used alongside cancer care
Gut and digestive health
General wellness and energy
Antioxidant support

Popular and traditional uses — not proof it works. See “Uses & effectiveness” below for the evidence.

Safety at a glance

OverallUse caution

Generally well tolerated in healthy adults, but quality and evidence vary, so check with a healthcare provider first.

PregnancyInsufficient reliable information

Insufficient reliable information available; avoid using.

Read the full pregnancy detail

BreastfeedingInsufficient reliable information

Insufficient reliable information available; avoid using.

Read the full breastfeeding detail

Pregnancy & breastfeeding ratings are from Natural Medicines (Therapeutic Research Center). Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

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Overview

Turkey tail (Trametes versicolor, also called Coriolus versicolor or cloud mushroom) is a common bracket fungus that grows on logs and tree stumps in forests around the world. Its name comes from the colorful, banded rings on its surface that look like the tail of a wild turkey.

It has been used for hundreds of years in traditional Chinese and Japanese medicine. Today people take it as a dietary supplement in capsules, powders, and teas. Two purified compounds from the mushroom, known as PSK (polysaccharide-K, or krestin) and PSP (polysaccharopeptide), have been used in some countries as part of cancer care.

How it works

Turkey tail contains polysaccharides, especially beta-glucans, along with the protein-bound compounds PSK and PSP. These are thought to act on the immune system by influencing certain white blood cells and immune signals.

Researchers believe these compounds may help the body's immune defenses respond more actively. The mushroom also contains antioxidants that may help protect cells from damage.

It is important to know that much of this information comes from laboratory and animal studies. How well these effects apply to people taking everyday supplements is still not fully understood.

Effectiveness

Does Turkey Tail Mushroom work?

Here’s what the research actually shows for each use — graded by Natural Medicines and reviewed by Dr. Brian Staiger, PharmD.

Evidence overview · 9 uses evaluated

1 Possibly effective 8 Insufficient evidence

How to read these evidence grades

Natural Medicines’ 7-point scale. We show each rating’s label word-for-word.

1EffectiveStrong, consistent evidence it works.

2Likely EffectiveGood evidence, though not yet conclusive.

3Possibly EffectiveSome evidence suggests a benefit.

4Possibly IneffectiveSome evidence it may not help.

5Likely IneffectiveFairly strong evidence it doesn’t help.

6IneffectiveStrong evidence it doesn’t work.

7Insufficient Reliable Evidence to RateToo little research to say either way.

Possibly Effective Cancer