Maitake Mushroom — answers to hen of the woods
Hasn’t appeared in a scanned product yet.
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: 2 records · searched August 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 August 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.
Educational information, not medical or safety advice. Consult a professional for allergies or medical concerns.