Herb ·Emerging evidence ·Reviewed May 2026
Birch tree fungus rich in antioxidants and immune-modulating compounds.
The bottom line
Evidence rating emerging. Most-documented uses: antioxidant, immune modulation, skin health. 18 sources indexed (2004–2026), with 4 interaction records on file.
Core mechanism
Contains betulinic acid, melanin, and beta-glucans. Betulinic acid has anti-tumor properties. Beta-glucans activate innate immunity via Dectin-1 receptors. Among the highest ORAC scores of any food.13
Can take any time; hot water extract preferred
Dosing protocol
Limited human evidence. Contains oxalate; caution in kidney stone history.
Ranked by evidence and value.
Real-world pricing across three quality tiers. Assumes Hot Water / Dual Extract.
Assumes 500-1,500 mg/day. Vendor basis: iHerb mushroom extracts, Vitacost, Amazon marketplace, and specialty dual-extract brands; fruiting-body extracts are premium. Updated 2026-05-28.
How much you'd eat to match a supplemental dose.
Chaga is a tough fungus typically consumed as tea or powder; beta-glucan and polyphenol content varies widely.
Both can lower blood glucose, so combining them may produce additive hypoglycemic effects, particularly in people taking antidiabetic medications.
Recommendation: Monitor blood glucose when combining. Watch for hypoglycemia symptoms (shakiness, sweating, confusion) and coordinate with a clinician if on diabetes medication.
Chaga and reishi are both medicinal mushrooms providing beta-glucan polysaccharides, often stacked for complementary immune-modulating and antioxidant support.
Recommendation: Reasonable to combine. Note that both may have mild antiplatelet activity, so monitor for bruising or bleeding if also using anticoagulants or before surgery.
Both are beta-glucan-rich medicinal mushrooms commonly combined for complementary immune modulation.
Recommendation: Acceptable to combine for immune support. No special timing needed; people on immunosuppressant therapy should consult a clinician given the immune-modulating activity.
Cordyceps and chaga are medicinal mushrooms often combined for immune and antioxidant support, supplying complementary beta-glucan polysaccharides.
Recommendation: Reasonable to combine. Both have shown modest glucose-lowering effects in preclinical studies, so people on diabetes medication should monitor blood sugar for additive hypoglycemia.
Numbered references. Citations throughout the page link here.
Zhang S, Zhang W, Wu X et al.. Inonotus obliquus Polysaccharides: Preparation, Structural Characteristics, Structure-Activity Relationships, Biological Activities and Applications. Nutrients. 2026
Windsor C, Kreynes AE, Chilton JS et al.. Comparative Study of Chaga (Inonotus obliquus) Dietary Supplements Using Complementary Analytical Techniques. International journal of molecular sciences. 2025
Scientific evidence supports anti-inflammatory, antioxidant, anticancer, anti-diabetic, anti-obesity, hepatoprotective, and immunomodulating properties of chaga extracts
Chaga possesses remarkable anticancer, antioxidant, anti-diabetic, anti-inflammatory, antimicrobial, and immunomodulating properties attributed to polysaccharides, triterpenoids, and polyphenols
Tee PYE, Krishnan T, Cheong XT et al.. A review on the cultivation, bioactive compounds, health-promoting factors and clinical trials of medicinal mushrooms Taiwanofungus camphoratus, Inonotus obliquus and Tropicoporus linteus. Fungal biology and biotechnology. 2024
Review of I. obliquus polysaccharides documenting antioxidant, anti-inflammatory, immunomodulatory, anti-tumor, anti-diabetic, and hepatoprotective activities, with structural characterization and mechanisms of action.
Review documents traditional use and modern pharmacological evidence for Chaga including antioxidant, anti-inflammatory, antimicrobial, and anticancer properties with potential mechanisms of action discussed.
Lee S, Lee HY, Park Y et al.. Development of End Stage Renal Disease after Long-Term Ingestion of Chaga Mushroom: Case Report and Review of Literature. Journal of Korean medical science. 2020
Chaga can scavenge reactive oxygen species, inhibit tumor growth, decrease inflammation and insulin resistance, and stimulate the immune system
Gil YG , Kang S , Chae A et al.. Synthesis of porous Pd nanoparticles by therapeutic chaga extract for highly efficient tri-modal cancer treatment. Nanoscale. 2018
Case report documenting oxalate nephropathy caused by excessive chaga mushroom intake, highlighting the high oxalate content as a kidney risk factor
Characterized polysaccharides, triterpenoids (including betulinic acid), polyphenols, and lignin metabolites responsible for chaga's health-benefiting properties
Chaga mushroom extract showed protective effects against oxidative DNA damage in human lymphocytes when challenged with H2O2
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