ReishiGanoderma lucidum
the most-studied of the threeStart here. Reishi is the only mushroom on this page with a substantial body of randomised human trials, whatever the outcome measured.
- Extraction
- Hot Water 10:1
- Beta-D glucans
- ≥30%
- USDA Organic
Reishi leads as the most studied mushroom we sell, with 17 clinical trials pooled in a 2025 review. Maitake is second, with randomised trials in healthy adults. Chaga is third: laboratory research links its antioxidant and anti-inflammatory activity to compounds the conk draws from the birch, and it has centuries of daily use behind it. All three are 10:1 hot water extracts, tested to 30%, 30% and 10% beta-glucans.
Start here. Reishi is the only mushroom on this page with a substantial body of randomised human trials, whatever the outcome measured.
Second, and the one to pick if you cook. Maitake is a genuinely good culinary mushroom as well as an extract.
Third, and honestly ranked. Chaga has the most enthusiastic marketing in this category and the least human evidence behind it.
Ganoderma lucidum
Start here. Reishi is the only mushroom on this page with a substantial body of randomised human trials, whatever the outcome measured.
Grifola frondosa
Second, and the one to pick if you cook. Maitake is a genuinely good culinary mushroom as well as an extract.
Inonotus obliquus
Third, and honestly ranked. Chaga has the most enthusiastic marketing in this category and the least human evidence behind it.
What customers report. Individual experience varies; none of this is a clinical claim.
The widest survey of the Reishi literature: 17 clinical trials covering 971 participants, at doses from 200 to 11,200 mg a day. Pooled analysis found significant improvements in BMI, serum creatinine, glutathione peroxidase and resting heart rate. Many other markers did not move, and the reviewers rate the certainty of the underlying trials as low and call for better-designed studies, which is the usual state of a field this active and this young.
Food Science & Nutrition · 2025Forty-seven healthy adults aged 60 and over ate bread containing 50 g of maitake daily for eighteen weeks. One strain produced a significant improvement on the Japanese Montreal Cognitive Assessment against placebo, and natural killer cell activity rose in the same group and tracked the cognitive score. Two strains were tested and one moved the needle, which tells researchers exactly where to look next.
Journal of Nutritional Science and Vitaminology · 2026A review pulling together the modern research on Chaga: antioxidant, anti-inflammatory and immunomodulatory activity, traced to the melanin, polysaccharides and triterpenes the conk accumulates from the birch it grows on. A consistent laboratory picture, and human trials are the natural next step.
Mycology · 2024