Roll Call

“Maitake Mushroom?”Here!hen of the woods

Plant

Hasn’t appeared in a scanned product yet.

As a supplement

Talk to your doctor or pharmacist.

Roll Call does not check drug interactions or assess personal safety.

A polypore mushroom native to Japan and North America, sold in supplements as dried powder or as extracts concentrated for specific polysaccharide fractions.

Why it’s used

Taken to support general immune function, and historically used in East Asian food and folk traditions.

What the evidence says

Laboratory and animal work, along with some small human trials on specific extracted fractions (such as D-fraction), has looked at immune-related activity, but this research does not reliably translate to claims about the whole dried mushroom or powder found on most labels. There is no NIH ODS fact sheet specific to maitake.

Where we looked

There was no paper to cite here, so this is the search instead — run it yourself and see what we saw.

  • PubMed: 15 records · searched September 2026"Maitake Mushroom"[Title/Abstract] AND (review[pt] OR "safety assessment"[Title/Abstract] OR "risk assessment"[Title/Abstract] OR toxicology[Title/Abstract] OR toxicity[Title/Abstract] OR characterization[Title/Abstract] OR characterisation[Title/Abstract])
  • PubMed: 3 records · searched September 2026"Maitake Mushroom"[Title/Abstract] AND ("dietary supplements"[MeSH] OR supplementation[Title/Abstract] OR supplement[Title/Abstract] OR supplements[Title/Abstract] OR "oral administration"[Title/Abstract]) AND (randomized controlled trial[pt] OR clinical trial[pt] OR meta-analysis[pt] OR systematic review[pt]) AND humans[MeSH]
  • PubMed: 72 records · searched September 2026"Maitake Mushroom"[Title/Abstract]

This says what this database holds under these terms. It is not a finding that no research exists.

Context

Evidence appears to exist but could not be verified to a citable source for the ingredient as typically sold — human trials in this area tend to use isolated, standardized polysaccharide extracts (like D-fraction or MD-fraction) rather than the whole mushroom powder or generic extract listed on most Supplement Facts panels. A reviewer looking to upgrade this grade should look for trials naming a specific standardized fraction and dose.

Insufficient dataToo little has been studied to say either way.

Rumors

  1. Maitake lowers blood sugar and improves insulin sensitivity.

    We haven’t found evidence strong enough to support this or rule it out.

    What was measured is not yet noted.

    Who’s saying this

    • gl-herb.com — we couldn’t open the site to see who runs it

  2. Maitake can lower blood sugar too much and cause hypoglycemia, especially with diabetes medication.

    We haven’t found evidence strong enough to support this or rule it out.

    What was measured is not yet noted.

    Who’s saying this

    • WellnessMama.com — an individual: natural living and health content for moms, founded by Katie Wells
      How we know who this is
      • “WellnessMama.com is an online resource for women and moms who want to live a healthier life.” (their page)
      • “Our founder, Katie, along with a team of researchers and medical advisors, analyze a wide variety of health, parenting, and natural living topics and summarize the information in a clear and usable way.” (their page)

  3. Maitake has antitumor activity and helps the body fight cancer.

    We haven’t found evidence strong enough to support this or rule it out.

    What was measured is not yet noted.

    Who’s saying this

    • WellnessMama.com — an individual: natural living and health content for moms, founded by Katie Wells
      How we know who this is
      • “WellnessMama.com is an online resource for women and moms who want to live a healthier life.” (their page)
      • “Our founder, Katie, along with a team of researchers and medical advisors, analyze a wide variety of health, parenting, and natural living topics and summarize the information in a clear and usable way.” (their page)

  4. Maitake D-fraction supports healthy immune function.

    We haven’t found evidence strong enough to support this or rule it out.

    What was measured is not yet noted.

    Who’s saying this

    • iherb.com — we couldn’t open the site to see who runs it

  5. Maitake D-fraction lowers high blood pressure.

    We haven’t found evidence strong enough to support this or rule it out.

    What was measured is not yet noted.

    Who’s saying this

    • LUCID — a brand: sells mushroom and nootropic coffee drinks
      How we know who this is
      • “Achieving a complete state of clarity is at the root of our journey here at LUCID.” (their page)
      • “Impacted and captivated by the powers of functional mushrooms and nootropics, we’ve chosen to meticulously forage only the finest ingredients, blending them into a daily drink that doesn't just taste fantastic—it's a catalyst for transformation.” (their page)