Chaga Mushroom

Also known as: Inonotus obliquus, Chaga, Birch mushroom, Cinder conk

Evidence under review. — Not yet rated

Medicinal mushroom with antioxidant and anti-inflammatory properties, but human clinical evidence is nearly absent.

What it does

Chaga mushroom is a parasitic fungus that grows on birch trees and has been used in folk medicine for centuries. Lab and animal studies suggest it contains compounds — including inotodiol and...
Evidence quality

Evidence base hasn't been formally rated yet. See research below.
Clinical dose

No established dose
Found in

Host Defense Mushroom Powders, 310 Chocolate Icing Shake, Beekeeper's Naturals (Multiple Products) and 8 more

What the Science Says

Chaga mushroom is a parasitic fungus that grows on birch trees and has been used in folk medicine for centuries. Lab and animal studies suggest it contains compounds — including inotodiol and polyphenols — that may reduce inflammation, scavenge free radicals, and modulate immune responses. One animal study found it reduced SARS-CoV-2 viral load in mice, and cell studies show anti-inflammatory effects in skin tissue, but no robust human clinical trials have confirmed these benefits.

What It Doesn't Do

Not proven to treat or prevent cancer in humans — cancer studies are lab-only. No human evidence it fights COVID-19 or other viruses. Not a proven immune booster in people. Don't expect detox benefits — that's marketing, not science.

Evidence-Based Benefits

Inotodiol, a compound in Chaga, reduces inflammatory cytokines in human skin cell studies.

Weak Evidence

Effective at: No established dose

Supporting studies (click to view on PubMed):

PMID 37886743 PMID 35897881

Chaga extracts show strong free radical scavenging activity in lab tests.

Weak Evidence

Effective at: No established dose

Supporting studies (click to view on PubMed):

PMID 36830005 PMID 41581894

High-dose Chaga causes kidney damage in rats due to its high oxalate content.

Weak Evidence

Effective at: Harmful at 3,844 mg/kg body weight in rats

Supporting studies (click to view on PubMed):

PMID 41555803

Absorption & Bioavailability

Unknown — inotodiol (a key active compound) has poor solubility and low oral bioavailability; a microemulsion formulation improved absorption in animal pharmacokinetic testing, but human data is lacking

Red Flags to Watch For

High oxalate content: animal studies show high-dose Chaga can cause kidney damage due to oxalate accumulation — especially risky for people prone to kidney stones
No established safe human dose — most evidence comes from animal or cell studies, not clinical trials
Widely marketed for cancer and immune benefits that have zero human clinical trial support
Over 1,000 supplement products registered despite only 1 human clinical trial indexed on PubMed

Supplement

Overhyped

Everyday Dose Medium Roast Instant Coffee+

Supplement

Overhyped

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Frequently Asked Questions

What does Chaga Mushroom do?

Medicinal mushroom with antioxidant and anti-inflammatory properties, but human clinical evidence is nearly absent.

What is the effective dose of Chaga Mushroom?

No established dose

Is Chaga Mushroom safe?

High oxalate content: animal studies show high-dose Chaga can cause kidney damage due to oxalate accumulation — especially risky for people prone to kidney stones

What doesn't Chaga Mushroom do?

Not proven to treat or prevent cancer in humans — cancer studies are lab-only.

Research Sources

PubMed
NIH DSLD

This information is for educational purposes only and is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Last updated: 2026-05-25