Chaga

Also known as: Inonotus obliquus, Chaga mushroom, birch mushroom, cinder conk

Evidence under review. — Not yet rated

Traditional fungus with antioxidant and anti-inflammatory activity in lab studies, but no proven human benefits yet.

What it does

Chaga is a parasitic fungus that grows on birch trees, long used in Russian folk medicine. Lab and animal studies suggest its extracts may have antioxidant, anti-inflammatory, 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, Best Earth Naturals Vegan Mushroom Complex and 15 more

What the Science Says

Chaga is a parasitic fungus that grows on birch trees, long used in Russian folk medicine. Lab and animal studies suggest its extracts may have antioxidant, anti-inflammatory, and immune-modulating properties, driven by compounds like beta-glucans, triterpenoids, and phenolics. No human clinical trials from the provided research confirm these effects translate to real-world health benefits.

What It Doesn't Do

Not proven to treat cancer in humans — lab results don't equal a cure. No solid evidence it boosts immunity in people. Not a proven heart health supplement. Don't assume 'natural' means safe at high doses.

Evidence-Based Benefits

Compounds in Chaga suppress inflammatory cytokines in lab cell studies.

Weak Evidence

Effective at: No established human dose

Supporting studies (click to view on PubMed):

PMID 37886743

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

Weak Evidence

Effective at: Harmful at 3,844.8 mg/kg body weight in rats

Supporting studies (click to view on PubMed):

PMID 41555803

Chaga extract reduced heart injury markers in rats exposed to extreme cold stress.

Weak Evidence

Effective at: 300–600 mg/kg in rats

Supporting studies (click to view on PubMed):

PMID 41796618

Absorption & Bioavailability

Unknown — no human pharmacokinetic data in the provided studies

Red Flags to Watch For

High oxalate content: animal studies show high-dose Chaga can cause kidney damage and oxalate-induced kidney injury
Reported cases of renal failure linked to Chaga consumption in humans, flagged in social media health research
Only one clinical trial indexed among 10 papers — the vast majority of evidence is animal or cell-based
Natural product variability: constituent levels differ between batches, making consistent dosing unreliable

Supplement

Overhyped

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Frequently Asked Questions

What does Chaga do?

Traditional fungus with antioxidant and anti-inflammatory activity in lab studies, but no proven human benefits yet.

What is the effective dose of Chaga?

No established dose

Is Chaga safe?

High oxalate content: animal studies show high-dose Chaga can cause kidney damage and oxalate-induced kidney injury

What doesn't Chaga do?

Not proven to treat cancer in humans — lab results don't equal a cure.

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