The short answer. There isn't much data on Maitake yet — 8 mentions, 2 with a clear outcome — so treat these numbers as anecdotal. There is a moderate body of research — 3 meta-analyses and 5 trials.
Out of 8 mentions; the other 75% didn't say how it went and aren't counted.
Of the people who reported each effect, the share who said it got better.
Systematic reviews and meta-analyses from PubMed, with their published conclusions.
At least one meta-analysis, or 5+ randomized controlled trials. The grade measures how much human research exists — read the conclusions below for what it found.
Conclusion: Nevertheless, the evidence is inconclusive to recommend the routine use of mushrooms for cancer patients. More trials are needed to explore mushroom use during and after cancer treatment.
PubMed 36995535 ↗Conclusion: Despite the lack of scientific evidence, maitake mushroom remains a popular agent in commercial products. Future randomized controlled trials are warranted.
PubMed 19476741 ↗Conclusion: GFP is a potential candidate for tumor treatment and clinical trials.
PubMed 34271115 ↗As stated by users — not a recommendation. Follow the label or your doctor.
How often each side effect came up across all reports.
First-hand experiences, quoted verbatim. We show one positive and one negative where both exist.
“plus cordyceps and maitake. That stuff really helped me get functioning again.”
User data from public discussions; research from PubMed. Information only, not medical advice — talk to a doctor before starting, stopping or combining anything. Data updated October 3, 2026. How we rate