Willow bracket (Phellinus igniarius)
A common, hard bracket fungus that mainly parasitizes willows, with documented traditional use as tinder and a brewed drink among Siberian and North American peoples — but with no significant clinical studies in humans.
Table of contents
TL;DR
A common, hard bracket fungus that mainly parasitizes willows, with documented traditional use as tinder and a brewed drink among Siberian and North American peoples — but with no significant clinical studies in humans.
- →Very limited data — available only from in vitro and animal studies, suggesting potential anti-inflammatory and antioxidant action, without confirmation in humans
| Latin name | Phellinus igniarius |
|---|---|
| Family | Hymenochaetaceae |
| Active substances | Polysaccharides, phenolic compounds |
| Form | No commercial form — historically dried material for a brewed drink or charred pulp |
| Evidence level | Very preliminary — in vitro and animal studies only, zero human studies |
| Interactions | No documented data |
| Status | Not available as a dietary supplement — ethnobotanical and historical significance only |
Understand
Overview
Willow bracket (Phellinus igniarius) is a perennial, woody bracket fungus that mainly parasitizes living willows, less often birches and poplars, causing severe white rot of the wood. It is very common across much of the temperate Northern Hemisphere.
Historically, the fruiting body had a practical significance unrelated to supplementation: peoples of Siberia and the Arctic used it for striking and carrying fire, and the charred pulp was traditionally mixed with tobacco for chewing. Modern clinical studies in humans are lacking — available data come almost exclusively from in vitro and animal studies.
It has to be said honestly that today there's no group of people who can be reliably promised a health benefit from this fungus — the available data are limited to in vitro studies and one study in mice, with no human studies whatsoever and no established dosing. The value of willow bracket today is mainly ethnobotanical and historical, not supplemental. Pregnant and breastfeeding women, as well as children, should avoid it entirely.
Where it's found
A very common bracket fungus, mainly parasitizing living willows, less often birches and poplars, causing white rot of the wood. Fruiting bodies are perennial and hard, and can grow on the same tree for decades.
History of use
Documented use by peoples of Siberia and the Arctic for striking and carrying fire; the charred pulp of the fruiting body was traditionally mixed with tobacco for chewing. There are no documented medicinal traditions comparable to the related tinder fungus, chaga.
Mechanism of action
In preclinical studies, polysaccharides and phenolic compounds were isolated from aqueous extracts and are credited with anti-inflammatory and antioxidant effects. In one study in mice, an aqueous extract reduced intestinal inflammation by lowering pro-inflammatory cytokine levels.
It's worth separating two strands of the available data: antimicrobial and antioxidant activity relates to a broad in vitro survey of European Phellinus specimens, not to a study of Phellinus igniarius itself acting in the body, while the reduction of intestinal inflammation in mice is a separate, single result in a different model. These two strands shouldn't be treated as one coherent mechanism of action.
Evidence: early-stage — based on 2 studies in this database.
Benefits
Check your profile
Not sure which supplements actually make sense for you?
Answer a few short questions about your lifestyle, diet, sleep, and goals. VitMode will build your profile and show supplements worth considering — with reasoning and evidence strength.
Recommendations take your answers and the strength of the scientific evidence into account. A supplement's popularity has no bearing on whether it gets recommended.
Practice
Frequently asked questions
No. Unlike chaga, it has no established position on the supplement market.
No — it's a completely different genus (Phellinus, not Inonotus), though both belong to the same family and are sometimes confused.
Dosage & timing
Typical dose
No established, safe dosing range for humans
Form
Historically: dried material for a brewed drink or charred pulp as tinder — this isn't a commercial product
References to traditional use concern non-standardized folk recipes, not clinical studies.
Best times to take it
- Not applicable
Safety
Side effects & contraindications
Possible side effects
No systematic safety data in humans
The fruiting body is hard, woody, and inedible
Contraindications
Pregnancy and breastfeeding
Children — no data
Interactions
No documented drug interactions
Is it worth taking?
Who it's for
- Very limited data — available only from in vitro and animal studies, suggesting potential anti-inflammatory and antioxidant action, without confirmation in humans
Not for
- Pregnancy and breastfeeding
- Children — no data
Evidence
Worth knowing
The same fruiting body can grow on a tree for many years, forming successive layers of pores.
Formerly used for striking fire — similar to the related tinder fungus.
Studies
An aqueous extract of willow bracket lowered pro-inflammatory cytokine levels in a mouse model of intestinal inflammation.
Sun Y et al., PLoS ONE, 2018
Bioactive Properties of Selected European Phellinus Species: A Comprehensive Study
Early-stage evidenceŚwiderski G, Kalinowska M, Zapora E, et al. · International Journal of Molecular Sciences · 2025
An analysis of 30 European samples of Phellinus fungi showed in vitro antimicrobial and antioxidant activity.
View studyThe aqueous extract of Phellinus igniarius ameliorates dextran sodium sulfate-induced colitis in mice
Early-stage evidenceSun Y, Zhong S, Yu J, Zhu J, Ji D, Hu G, Wu C, Li Y · PLoS ONE · 2018
A study in mice with induced intestinal inflammation showed that an aqueous extract lowered pro-inflammatory cytokine levels.
View studySources & bibliography
Citations are illustrative for this demo version and require full bibliographic verification by the editorial team before production publication.
Compare with similar entries
About the authors of this entry
Author
Michał NowakClinical Dietitian
Michał started out as a long-distance runner, before an injury forced him to rethink his career. Looking for a faster way back into shape, he discovered sports nutrition and never left — fascinated by the gap between the research and what "everyone knows" at the gym. He completed a degree in clinical dietetics, earned a sports-nutrition coaching certification, and ran his own practice for several years before joining VitMode. His writing keeps returning to one theme: a supplement won't replace the basics, but the right one, at the right time, makes a real difference — and that's the difference he tries to describe precisely, with citations instead of slogans. He still runs, though these days, as he puts it, purely for the fun of it.
154 publications on this site
Medical review
dr Piotr ZielińskiEndocrinologist
Piotr has practiced endocrinology for more than fifteen years, mostly in male hormonal disorders and metabolic health. He joined VitMode as a scientific consultant because, as he jokes, he got tired of explaining the same testosterone questions at every appointment and decided to write the answers down properly, once. He reviews content on hormone therapy, supplement pharmacology and drug interactions, making sure articles never turn into encouragement to self-supplement in situations that genuinely need diagnostics and medical supervision. His professional motto — "evidence first, enthusiasm second" — has come up more than once with a patient who arrived with a supplement plan they found online.
268 publications on this site
Related entries
3.6Phellinus baumii (Sanghuang)
An East Asian bracket fungus from the confusing 'sanghuang' species complex, studied mainly in China and Korea for anti-inflammatory and anti-cancer polysaccharides in vitro — essentially absent from Western markets.
4.0Siberian Chaga (Inonotus obliquus)
A black, corky growth that parasitizes birch trees, traditionally brewed as a tea in Siberia and Scandinavia — rich in antioxidant compounds, but with practically no clinical studies in humans.
4.1Birch Polypore (Fomitopsis betulina)
A bracket fungus common on birches in Poland, known for its discovery alongside Ötzi's remains — historically fascinating, but still not clinically confirmed as a supplement.
4.0Shaggy Bracket (Inonotus hispidus)
A rare, striking orange-rust bracket fungus in Poland, parasitizing mainly apple and ash trees; a relative of chaga with limited, mostly Chinese, in vitro research into anticancer and antioxidant compounds.
3.4Clustered Bracket (Inonotus cuticularis)
A bracket fungus rare in Poland, growing mainly on beech trees, chemically characterized in essentially just one Iranian screening study — otherwise, practically no scientific data exists on this species.
4.5Turkey Tail
The mushroom behind PSK and PSP — the only fungal polysaccharides registered in Japan as drugs supporting chemotherapy. Among the most solid clinical evidence of any functional mushroom, but this is NOT a standalone cancer therapy.
4.5Beta-glucans
Polysaccharides responsible for most of the documented immunomodulatory properties of medicinal mushrooms, oats, and barley — the common denominator behind dozens of species described in this knowledge base.
Comments (2)
- KW
Kasia W. 2 weeks ago
Very clearly explained, especially the interactions section — I hadn't seen it laid out this well anywhere else.
- MT
Marek T. a month ago
Are you planning to update this with the newest study from this year? I saw an interesting meta-analysis.