Culinary mushrooms

Also called: shiitake, maitake, button mushrooms.

Last reviewed 2026-09-16. How this works.

Treating cancer Grade D

No human evidence of benefit, or none that survived testing.

There is lab work and a few small studies, and nothing showing mushrooms change a cancer.

Mechanism, and some small studies. Nothing measuring what a cancer did.

The claim

The claim is that mushrooms eaten as food have anti-cancer effects, usually argued across from the medicinal mushroom literature.

What it does

Certain mushroom polysaccharides affect immune signalling. Turkey tail has its own entry in this register because it has its own trial literature; eating mushrooms is a different exposure and this entry grades that.

The evidence

Seventeen completed studies are registered across mushrooms and mushroom preparations in cancer.1

The two with the strongest designs do not test what this entry is about. One phase 3 trial with an overall survival endpoint tests a multi-herb formula given with chemotherapy. Another phase 3 measures quality of life. Neither tests a culinary mushroom.1

The rest measure markers and tolerability. Nothing in the completed registry record tests mushrooms as food against what a cancer does.1

What is absent

No completed trial tests mushrooms as food against a cancer outcome. The trials in the registry that carry outcome endpoints test herbal preparations, not food.

Scope: culinary mushrooms, any tumour type.

Established by registry search, ClinicalTrials.gov, query intervention "mushroom OR reishi OR shiitake OR maitake", condition "cancer", status completed, checked 2026-09-16. Result: seventeen completed studies; no culinary mushroom trial with a cancer outcome.1

What to ask

Is there anything in my diet that would interfere with treatment, rather than anything I should add?

The dish-to-person gap

Culinary mushrooms is eaten as food rather than taken as a measured compound, and the register holds no human pharmacokinetic measurement for it.

When to call your team — no warning signs are recorded

If you have changed how you eat because of something you have read, or are thinking about it, the people treating you can only weigh that if they know about it. That is true when nothing has been written down here, and it is most true then.

The register records no warning signs for this entry. That is not a statement that nothing can go wrong.

Interactions

The register holds no measured interaction between this food and a cancer treatment class. An empty list means nobody has measured it, not that nothing would happen. Concentrated extracts are a different question from the food.

Nobody having looked is not the same as nothing being there. That is what this line says and all it says.

The whole interaction list, and how to turn it into a pharmacy review request.

Find a trial instead

The medicinal mushroom preparations have their own entries and their own trial literature.

Search ClinicalTrials.gov for recruiting studies of mushroom OR shiitake OR maitake

A trial is the same decision with monitoring, a known preparation and a doctor who knows what else you are taking.

References

  1. A search of the ClinicalTrials.gov registry for completed studies of this intervention in cancer, run on 16 September 2026. 17 completed studies returned.

    https://clinicaltrials.gov/api/v2/studies?query.intr=mush…

    How this was reached: search run during build, via a search run during the content build; not a source the manuscript carries.