Guide
What is chaga mushroom? A plain guide
Chaga mushroom is Inonotus obliquus, a fungus that grows on birch trees. Most chaga research and tea describe the hard black conk; capsules are often mycelium, a different material. Reviews say human evidence is lacking.
Chaga mushroom is Inonotus obliquus, a fungus that grows on birch and other trees. What most people call chaga is not a cap-and-stem mushroom but a hard black growth on the trunk, the conk. It has a long history as a folk tea, and a 2020 review of the research concluded that studies meeting evidence-based medicine criteria are still needed.
What chaga mushroom is
Chaga is a fungus that lives on birch and other tree species, as a 2022 case report describes it. The part people harvest is the dark, crusty conk. Analytical chemists call it a canker or sclerotium, and it carries compounds the lab analysis of chaga supplements found in whole canker: triterpenoids such as inotodiol, and phenolics. That is where the folk reputation and most published lab work come from.
What chaga mushroom looks like, and where it grows
The conk looks like burnt, cracked charcoal fixed to a tree trunk, with a softer rust-brown interior. It grows on birch and other trees; we are not citing a range survey, so we won't draw a map. This is also not a foraging guide. Identifying wild chaga, deciding when a conk is worth harvesting and telling it from look-alikes is skilled work, and nothing on this page should be used to identify a fungus you plan to eat.
Conk, mycelium, extract: three different things
| Form | What it is | What to know |
|---|---|---|
| Wild conk (chunks, powder, tea) | The hard black growth from a birch trunk | The material most chaga research and folk use describes |
| Extract (tincture, extract powder) | Conk, or sometimes other tissue, extracted in water or alcohol | Strength depends on the extraction; the label should say what was extracted |
| Mycelium powder | The fungus's thread-like vegetative body, usually grown in a lab on a substrate | A different material from conk; the grain it grows on may remain in the powder |
The difference is not cosmetic. A 2025 analysis compared wildcrafted chaga canker with chaga supplements and found the grain-fermented mycelium products starch-rich and chemically very different from canker. Its authors are employed by a supplier of wildcrafted chaga, so read it as an interested party's analysis, but the point it makes is the reason this guide keeps the forms apart: results from conk do not transfer automatically to mycelium.
What our capsules are
Electric Tiger Chaga Mushroom is the mycelium kind, not conk. Two capsules contain 1,000 mg of organic chaga (Inonotus obliquus) mushroom mycelium powder standardized to 40% polysaccharides (400 mg), 30 servings a bottle, as low as $19.19 a bottle on subscription. The label does not state what the mycelium was grown on or how the polysaccharides were measured, and it prints no beta-glucan, triterpenoid or oxalate figure. See the label.
What is chaga mushroom used for?
Traditionally it has been brewed as a tea in folk medicine. As a modern supplement it is sold for a long list of purposes, often described as an "adaptogen". We found no human trial that tests chaga for any of them: a PubMed search on 2 October 2026 for Inonotus obliquus with the clinical-trial publication type returned no records. The research that exists is mostly cell and animal work on extracts, and the reviewers say so. The best-known study of chaga on human material, from 2007, treated white blood cells in a dish; nobody swallowed anything. "Adaptogen" is a marketing category, not something a trial of chaga has tested. For what the lab work does and doesn't mean, see chaga mushroom benefits: what the research does and doesn't show.
How people use it, and the one documented risk
People simmer conk for tea, take tinctures, or swallow powder and capsules. We cite no study comparing these. What the literature does document in people is harm at large intakes: two case reports, in 2022 and 2020, of kidney damage from oxalate crystals after chaga powder, one at 10-15 g a day and one over years. Chaga is naturally high in oxalate. These cases do not show that a 1,000 mg mycelium serving does the same, but they are why who should not take chaga mushroom comes before any benefit question. Dose is covered in how much chaga mushroom to take.
Questions people ask
How do chaga mushrooms grow?
On living birch and other trees, where the fungus forms the hard black conk. Mycelium supplements are different: the fungus is cultured, usually on a substrate such as grain, in a lab. Our label does not say which substrate.
Why take chaga mushroom?
People give many reasons, but no human trial supports any of them at any dose, and none tested our mycelium powder. We would rather say that than borrow lab results for a capsule.
Chaga vs lion's mane, reishi, turkey tail or cordyceps?
These are different fungi, and we make no effect comparison between them. Chaga has no human trial to compare with.
Can you eat chaga mushroom?
The conk is woody and is normally steeped or ground rather than eaten whole. Its oxalate content is the safety consideration, covered in chaga mushroom side effects.
What about chaga for dogs, skin or skincare?
We found no study on any of them and give no guidance. For a pet, ask a veterinarian.
Sources
- Inonotus obliquus - from folk medicine to clinical use A 2020 review of chaga research says the evidence is mostly cell and animal work and that properly designed human studies are still needed.
- Comparative Study of Chaga (Inonotus obliquus) Dietary Supplements Using Complementary Analytical Techniques Lab analysis of chaga supplements found grain-fermented mycelium products chemically very different from wild chaga conk, and starch-rich.
- Chaga mushroom-induced oxalate nephropathy that clinically manifested as nephrotic syndrome: A case report A 69-year-old man taking 10-15 g a day of chaga powder plus vitamin C for 3 months developed acute kidney injury with oxalate crystals; he recovered with treatment.
- Development of End Stage Renal Disease after Long-Term Ingestion of Chaga Mushroom: Case Report and Review of Literature A 49-year-old man who took chaga powder for years ended up with end-stage kidney disease and oxalate deposits; the leftover powder was very high in oxalate.
- Chaga mushroom extract inhibits oxidative DNA damage in lymphocytes of patients with inflammatory bowel disease In white blood cells from 20 patients and 20 healthy people, a chaga extract added to the dish reduced induced DNA damage; nobody swallowed any chaga.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
