Resinous Polypore (Ischnoderma resinosum)
A rare bracket fungus that decomposes dead hardwood — the scientific data is limited to a single laboratory study, and the species doesn't exist as a supplement or food product.
Table of contents
TL;DR
A rare bracket fungus that decomposes dead hardwood — the scientific data is limited to a single laboratory study, and the species doesn't exist as a supplement or food product.
- →A single in vitro study (2022) showed strong antioxidant properties of the isolated polysaccharide
- →A potentially interesting subject for further research into natural antioxidants
- →No proven health benefits in humans or animals whatsoever
| Latin name | Ischnoderma resinosum |
|---|---|
| Family | Fomitopsidaceae |
| Active compounds | An isolated heteropolysaccharide (described in a single study, 2022) |
| Form | No commercial form — the species doesn't exist as a supplement, extract, or food product |
| Level of evidence | One in vitro study on an isolated compound — no independent confirmation |
| Interactions | No documented drug interactions |
| Status | Rare species, listed on Poland's Red List of fungi |
Understand
Overview
The resinous polypore (Ischnoderma resinosum) is a bracket fungus that forms large, semicircular, tongue-shaped fruiting bodies, velvety to the touch, with a sweetish, resinous smell. It develops as a saprotroph on dead hardwood, most often beech. In Poland it's a rare species, listed on the Red List.
This entry is purely informational and mycological — the species is neither traded as a dietary supplement nor a recognized edible mushroom of any real culinary value, and solid research on it simply doesn't exist.
Who can genuinely benefit from this, and who can't? Currently, no one, in health terms. This is a rare species listed on the Red List, not practically edible, and the only available data comes from a single in vitro study on an isolated polysaccharide — not on the whole fruiting body or an extract that could be prepared at home. There is no basis for recommending it to anyone for health purposes.
Where it's found
Ischnoderma resinosum is a saprotroph that develops on dead hardwood, most often beech trunks and stumps. Fruiting bodies appear mainly in autumn in well-preserved, older stands. In Poland it's a rare species.
Mechanism of action
The only published chemical study isolated a heteropolysaccharide from the fruiting bodies that, in chemical tests, effectively neutralized free radicals and protected erythrocytes and human HepG2 liver cells from oxidative stress in vitro.
It's worth noting that the described effect concerns a single, isolated fraction — the heteropolysaccharide — not the whole fruiting body or a simple infusion that could be prepared at home. The tests covered protection of erythrocytes and the human HepG2 liver cell line from oxidative stress under cell-culture conditions — a preclinical model, not proof of effect in a living organism.
Evidence: limited — based on 1 study in this database.
Benefits
Practice
Frequently asked questions
Most mycological sources classify it as inedible or of no culinary significance.
Dosage & timing
Typical dose
Not applicable — the species doesn't exist in supplement, extract, or food product form
Form
No commercial form
This entry is purely informational and mycological in nature; it is not a recommendation to forage or consume.
Best times to take it
- Not applicable
Safety
Side effects & contraindications
Possible side effects
No data — the species is neither eaten nor used as a supplement
Contraindications
No established contraindications, due to the complete absence of studies in humans
Consumption without certain species identification is not recommended
Interactions
No documented drug interactions
Is it worth taking?
Who it's for
- A single in vitro study (2022) showed strong antioxidant properties of the isolated polysaccharide
- A potentially interesting subject for further research into natural antioxidants
- No proven health benefits in humans or animals whatsoever
Not for
- No established contraindications, due to the complete absence of studies in humans
- Consumption without certain species identification is not recommended
Evidence
Worth knowing
The species is listed on Poland's Red List of fungi with status V (vulnerable to extinction).
Fruiting bodies can reach up to 30 cm in diameter and appear mainly in autumn.
Studies
Cellular Antioxidant Properties of Ischnoderma Resinosum Polysaccharide
Early-stage evidenceLiao C, et al. · Molecules · 2022
The isolated polysaccharide showed strong antioxidant activity in chemical tests and protected human HepG2 liver cells from oxidative stress in vitro.
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
Julia WiśniewskaEditor, Neurohacking & Sleep
Julia writes about nootropics, chronobiology and recovery protocols.
45 publications on this site
Medical review
dr Piotr ZielińskiEndocrinologist
Piotr reviews content on hormones, metabolic health and supplement pharmacology.
131 publications on this site
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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.