Chaga

Chaga is a parasitic fungus growing on birch trees, used in Russian and Siberian folk medicine for centuries. It contains beta-glucans, betulinic acid (from birch), melanin, and polyphenols. In vitro and animal studies suggest immunomodulatory, antitumor, and antioxidant properties. However, human evidence is extremely limited - only case series exist. One case report noted kidney damage from excessive chaga consumption due to high oxalate content. Popular but under-researched.

Quick Answer

What it is

Chaga is a parasitic fungus growing on birch trees, used in Russian and Siberian folk medicine for centuries. It contains beta-glucans, betulinic acid (from birch), melanin, and polyphenols.

Key findings

Grade C: Antitumor Effects
Grade C: Antioxidant Activity
Grade D: Immune Function

Safety

This is an adverse effect warranting caution.

ℹ️ Quick Facts: Chaga

Quick Facts: Chaga

Best Evidence:Grade C
Conditions Studied:2
Research Outcomes:8
Key Effect:Antioxidant Status

Outcomes by grade:

2 conditions · 8 outcomes

Detailed Outcomes

Antitumor Effects

Multiple in vitro studies show chaga extracts inhibit proliferation of various cancer cell lines including lung adenocarcinoma (A549), colon, breast, and liver cells. Betulinic acid from chaga induces apoptosis. Animal studies demonstrate tumor growth reduction. No human clinical trials exist.

moderate↓Improves

Immune Function

Preclinical studies show beta-glucans from chaga activate macrophages and natural killer cells, enhancing innate immune function. Some evidence of cytokine modulation. No human trials have been conducted.

small↑Improves

Blood Glucose

In alloxan-induced diabetic mice, chaga water extract reduced blood glucose levels and improved lipid profiles. Polysaccharides produced under optimized fermentation conditions also showed hypoglycemic activity. Proposed mechanism involves alpha-glucosidase inhibition. No human data.

moderate↓Improves

Anti-inflammatory Effects

In vitro and animal studies demonstrate anti-inflammatory activity of chaga extracts, including reduced inflammatory markers. One study compared chaga with germinated brown rice extracts and found significant anti-inflammatory effects. No human clinical evidence.

small↓Improves

Antiviral Activity

In vitro studies show chaga extract inhibits hepatitis C virus replication in cell cultures. A separate study demonstrated activity of aqueous extracts against human immunodeficiency virus. Both findings are limited to cell culture models with no human data.

small↑Improves

Acetylcholinesterase Inhibition

Triterpenoids isolated from chaga fruiting bodies act as bivalent and dual inhibitors of both acetylcholinesterase and butyrylcholinesterase in vitro, suggesting potential relevance to neurodegenerative conditions. No animal or human data on cognitive outcomes.

small↓Worsens

Antioxidant Activity

In vitro assays (ORAC, DPPH) demonstrate high antioxidant capacity from chaga's melanin and polyphenol content. Animal models show reduced oxidative stress markers. Polysaccharide fractions from wild chaga conks show greater activity than cultivated mycelium.

moderate↑Improves

Kidney Damage Risk (Oxalate Nephropathy)

A case report documented chaga mushroom-induced oxalate nephropathy presenting as nephrotic syndrome. Chaga contains high levels of oxalates, and excessive consumption may cause kidney injury. This is an adverse effect warranting caution.

1 participants

moderate↑Worsens

Evidence by Condition

Best grade per condition (each condition may have multiple outcomes)

CAntioxidant Status

1 outcome · 4 studies

↑Antioxidant ActivityImproves

DAcute Kidney Injury

1 outcome · 1 study

↑Kidney Damage Risk (Oxalate Nephropathy)Worsens

Research Citations (17)

Chemical Content and Cytotoxic Activity on Various Cancer Cell Lines of Chaga (Inonotus obliquus) Growing on Betula pendula and Betula pubescens.

Pharmaceuticals (2024)

PMID: 39204121

Antidiabetic activity of Inonotus obliquus water extract in alloxan-induced diabetic mice.

Journal of Complementary & Integrative Medicine (2024)

PMID: 39523023

Comparison of Bioactive Secondary Metabolites and Cytotoxicity of Extracts from Inonotus obliquus Isolates from Different Host Species.

Molecules (2023)

PMID: 37446570

Triterpenoids as bivalent and dual inhibitors of acetylcholinesterase/butyrylcholinesterase from the fruiting bodies of Inonotus obliquus.

Phytochemistry (2022)

PMID: 35427650

Chaga mushroom-induced oxalate nephropathy that clinically manifested as nephrotic syndrome: A case report.

Medicine (2022)

PMID: 35451393

Comparison of Polysaccharides Extracted from Cultivated Mycelium of Inonotus obliquus with Polysaccharide Fractions Obtained from Sterile Conk (Chaga) and Birch Heart Rot.

Journal of Fungi (2021)

PMID: 33800424

Simultaneous Use of Stimulatory Agents to Enhance the Production and Hypoglycaemic Activity of Polysaccharides from Inonotus obliquus by Submerged Fermentation.

Molecules (2019)

PMID: 31810277

Chaga (Inonotus obliquus), a Future Potential Medicinal Fungus in Oncology? A Chemical Study and a Comparison of the Cytotoxicity Against Human Lung Adenocarcinoma Cells (A549) and Human Bronchial Epithelial Cells (BEAS-2B).

Integrative Cancer Therapies (2018)

PMID: 29484963

Inonotus obliquus - from folk medicine to clinical use

J Tradit Complement Med (2015)

PMID: 26853962

Antiviral activity of aqueous extracts of the birch fungus Inonotus obliquus on the human immunodeficiency virus.

Voprosy Virusologii (2015)

PMID: 26182655

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