Maitake Mushrooms and Cancer: What Does the Research Actually Show?

Maitake mushrooms have attracted considerable interest in cancer research.

Also known as Grifola frondosa, maitake is an edible mushroom traditionally used in East Asian medicine. More recently, researchers have been investigating compounds found in maitake—particularly polysaccharides and proteoglycans—for their potential effects on the immune system and other biological pathways relevant to cancer.

So, can maitake mushrooms actually help people with cancer?

The short answer is: there is interesting research, but we are not yet at the point where maitake can be considered a cancer treatment.

Understanding where the evidence comes from—and where the gaps remain—is important when considering maitake as part of integrative cancer care.

Why are researchers interested in maitake?

Maitake contains a number of biologically active compounds, including beta-glucans and other polysaccharides.

Some of these compounds have been studied for their effects on immune cells such as:

• Natural killer (NK) cells

• Macrophages

• T cells

• Dendritic cells

Laboratory and animal studies suggest that maitake-derived compounds can influence immune signalling and other pathways involved in the body's response to abnormal cells.

This is one reason medicinal mushrooms have become an area of interest in cancer research.

But there is an important distinction:

An effect seen in a laboratory or animal study does not automatically translate into a meaningful benefit for people with cancer.

Clinical research is needed to determine whether these biological effects actually improve symptoms, treatment tolerance, quality of life, cancer outcomes, or survival.

What do we know about maitake mushrooms and cancer?

The human research on maitake is still relatively limited, but there have been several interesting studies.

Early research in people with cancer

One early study investigated a maitake extract known as MD-fraction in people with different types of cancer.

The researchers reported improvements in some patients and observed changes in immune-cell activity when maitake was used alongside chemotherapy. However, this was a small and early study, and it cannot establish that maitake treats or controls cancer.

This distinction is important.

A study showing that a supplement changes an immune marker—or that some participants experience an improvement—is not the same as demonstrating that the supplement improves cancer survival or prevents recurrence.

What about natural killer cells?

NK cells are part of the body's innate immune system and play a role in recognizing and destroying certain abnormal cells.

Because of this, researchers have been interested in whether maitake-derived compounds can influence NK-cell activity.

Some small human studies have reported changes in NK-cell activity following administration of maitake D-fraction.

This is biologically interesting, but it is important not to overinterpret it.

Increasing NK-cell activity is not the same thing as proving that a supplement treats cancer.

Cancer biology is considerably more complicated than simply turning the immune system "up."

A more recent clinical trial

One of the more interesting pieces of evidence comes from a randomized clinical trial involving 141 people with advanced laryngeal and pharyngeal cancers receiving concurrent chemotherapy and radiation.

Participants received maitake D-fraction or placebo during chemoradiotherapy.

The study reported fewer severe treatment-related adverse events and better quality-of-life measures in the maitake group, including a greater proportion of participants whose global quality of life had returned toward baseline at six months.

This is encouraging because it looks at outcomes that matter directly to patients—not just laboratory measures of immune function.

However, it is still one clinical trial in a specific cancer population, and the findings should not be generalized to every cancer or every cancer treatment.

More research is needed to determine whether similar benefits occur in other cancers and treatment settings.

What about chemotherapy?

This is an area of particular interest in maitake research.

Some preclinical studies suggest that maitake compounds may influence immune recovery and other responses associated with chemotherapy. There have also been small clinical studies investigating maitake alongside cancer treatment.

However, whether maitake is appropriate during chemotherapy depends on the specific chemotherapy regimen, dose, formulation, and individual patient.

This is particularly important because a supplement can have biological effects that are potentially relevant to treatment.

The question shouldn't simply be:

"Is maitake safe during chemotherapy?"

It should be:

"Is this particular maitake preparation appropriate for this person receiving this particular treatment?"

What about targeted therapies such as CDK4/6 inhibitors?

This is an especially interesting area of research because CDK4/6 inhibitors—such as palbociclib, ribociclib, and abemaciclib—are now an important component of treatment for some hormone-receptor-positive breast cancers.

There is still much to learn about how medicinal mushrooms interact with targeted cancer therapies.

This is one reason I would be cautious about extrapolating findings from studies of maitake with chemotherapy or other treatments to people taking CDK4/6 inhibitors.

Evidence from one treatment setting cannot automatically be applied to another.

This is also an area where more clinical research is needed.

Does maitake treat cancer?

Based on the current evidence, no—not in the sense of being an established cancer treatment.

Laboratory and animal research has demonstrated interesting effects, and some early clinical studies have reported changes in immune function, treatment-related symptoms, or quality of life.

However, there isn't sufficient evidence to conclude that maitake supplements can cure cancer, shrink tumours, prevent recurrence, or replace conventional cancer treatment.

Maitake should therefore be thought of as a potential supportive therapy under investigation, rather than a stand-alone cancer treatment.

What about maitake as a food?

This is an important distinction.

Maitake is an edible mushroom and can be incorporated into the diet like other culinary mushrooms.

Eating maitake as a food is quite different from taking a concentrated maitake extract.

Supplements may contain much higher concentrations of specific compounds, and different products can vary substantially in their extraction methods, standardization, and composition.

Therefore, research involving a specific maitake extract should not automatically be interpreted as evidence that eating maitake mushrooms will produce the same effect—or that a random maitake supplement will contain the same compounds in the same amounts.

Are maitake supplements safe?

Maitake is generally considered safe as a food.

Concentrated supplements are a different question.

Potential concerns include effects on blood sugar and blood clotting. Memorial Sloan Kettering notes that maitake may increase the effects of blood-sugar-lowering medications and may increase bleeding risk when combined with warfarin.

This is particularly relevant for people with cancer because they may be taking multiple medications at once.

The quality and formulation of the supplement also matter.

For these reasons, I recommend discussing medicinal mushroom supplements with your healthcare team before starting them during cancer treatment.

What about "immune boosting"?

Maitake is often marketed as an "immune-boosting" mushroom.

The research is more complicated than that phrase suggests.

Maitake can influence immune activity, but immune function is not simply a matter of having "more" or "less" immune activity.

Different cancer treatments interact with the immune system in different ways. In some situations, stimulating certain immune pathways may be desirable; in others, it may not be.

There is also evidence that maitake extracts can have different effects on immune function depending on the context and dose. Researchers studying maitake have described both immune-stimulating and immune-suppressing effects.

This is why I prefer to talk about immune modulation rather than simply "boosting immunity."

What does this mean if you're considering maitake during cancer treatment?

If you're interested in maitake, I don't think the answer should automatically be "yes" or "no."

Instead, several questions are worth considering:

What are you hoping to accomplish?

Are you interested in supporting treatment tolerance, quality of life, nutritional health, immune function, or something else?

What cancer treatment are you receiving?

Evidence from one chemotherapy regimen or cancer type doesn't necessarily apply to another.

What specific product are you considering?

The research may involve a particular extract or standardized preparation that is quite different from the product available on a supplement shelf.

What medications are you taking?

Potential interactions need to be considered, particularly when there are effects on blood sugar, bleeding, immune function, or drug metabolism.

What does the evidence actually show?

A promising laboratory study is worth paying attention to—but it isn't the same as a positive clinical trial.

Where does maitake fit into integrative cancer care?

This is where I think medicinal mushrooms become particularly interesting.

Integrative cancer care isn't about finding a natural substance that replaces conventional cancer treatment.

Instead, it asks:

"Are there evidence-informed approaches that can safely complement conventional treatment and support the person receiving it?"

For maitake, the research is promising enough to be interesting, but not mature enough to justify broad recommendations for everyone with cancer.

That distinction matters.

It allows us to be optimistic about emerging research without overstating what we currently know.

The bottom line

Maitake is a fascinating medicinal mushroom with a growing body of cancer research behind it.

Laboratory and animal studies suggest that compounds in maitake can influence immune function and other biological pathways. Small human studies have also reported changes in immune activity, and a randomized trial in people receiving concurrent chemoradiotherapy for advanced head and neck cancers found improvements in some treatment-related outcomes and quality-of-life measures.

But there is still much we don't know.

Maitake has not been established as a treatment for cancer, and research on its use alongside different cancer therapies remains limited.

For now, the most appropriate way to think about maitake is as an interesting area of supportive-care research that may have a role for some individuals when carefully considered in the context of their cancer treatment.

And that's ultimately what makes research like this so valuable: it gives us new questions to investigate while reminding us to distinguish what is promising from what is proven.

Why I'm interested in maitake research: During my residency in integrative oncology, I had the opportunity to work on a clinical trial investigating maitake and immune function in people receiving chemotherapy and/or CDK4/6 inhibitors. The study has not yet been published, but the experience contributed to my interest in the evolving research around medicinal mushrooms and cancer care.

Interested in learning more about medicinal mushrooms?

If you're considering maitake or another medicinal mushroom during cancer treatment, an individualized consultation can help review the evidence, your cancer treatment, medications, other supplements, and the specific product you're considering.

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Important note

This article is intended for general educational purposes and does not replace individualized medical advice or conventional cancer treatment. Maitake and other medicinal mushroom supplements may interact with medications or cancer therapies. If you are undergoing cancer treatment, discuss any new supplement with your oncology and healthcare team before starting it.