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Chaga Mushroom (Inonotus obliquus)
A birch fungus rich in antioxidant compounds in the lab. The honest verdict: the human evidence is essentially absent — no clinical trials, only cell, animal, and review data.
What the evidence says
Most Chaga studies are mechanism or observational rather than RCTs that measure a clinical effect — keep findings provisional.
Most evidence is from high-quality studies published 2005–2026.
Based on 25 studies
Confidence
Low confidenceBy outcome
Antioxidant and immune activity is well documented, but the evidence base is almost entirely preclinical reviews and cell/animal studies with no human RCTs or meta-analyses, keeping the score emerging.
8 trials ongoing or recruiting · 55 completed on ClinicalTrials.gov
7 of the completed trials have posted results
Registered trials show research momentum for Chaga, not proof of effect — a registration is a plan, and posted results are sponsor-reported, not peer-reviewed. They are never counted toward the evidence rating above.
Browse these trials on ClinicalTrials.govClinicalTrials.gov · as of Oct 2026
Chaga is a parasitic fungus that grows on birch trees in cold climates and has been used in Russian and Northern European folk medicine for centuries. It contains melanin, beta-glucans, and betulinic acid, and shows antioxidant and immune-modulating activity in lab and animal studies.
But that is where the evidence stops: there are no human clinical trials and no meta-analyses on any health outcome. The widely-repeated claims about immunity, inflammation, and oxidative stress rest on preclinical work that has not been shown to translate to people.
One of the highest ORAC values of any food
Polysaccharides raised lymphocyte activity in laboratory studies
Reduces systemic inflammation
How Chaga works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.
Consult doctor due to immune-modulating effects
Avoid — chaga is very high in oxalates; oxalate nephropathy and kidney injury have been reported with heavy/prolonged use.
May enhance anticoagulant effects
May lower blood sugar; monitor levels A grade for this interaction is held for clinical review and has not been validated, so no severity is given. The precaution still applies: ask a pharmacist about the exact supplement and medicine. Do not stop or change prescribed medicines based on this notice.
Tip: Start with lower dose
Chaga has an evidence score of 3.5/10 — emerging evidence based on 25 indexed studies. A birch fungus rich in antioxidant compounds in the lab. The honest verdict: the human evidence is essentially absent — no clinical trials, only cell, animal, and review data. Representative study: PMID 34613845.
The commonly studied dose of Chaga is 1-3g dried mushroom or 500-1500mg extract daily (a typical label dose, none of the cited studies is a human trial). Individual needs vary — start at the lower end of the range and adjust based on how you respond.
The best time to take Chaga is in the morning. Taking it with food is preferred. Chaga (Inonotus obliquus) contains immunomodulatory beta-glucans, betulinic acid, and melanin-complex antioxidants.
Chaga has a safety rating of "moderate". That is a category, not a measure of individual risk, and there are precautions worth knowing. Reported side effects are uncommon and include GI upset. Use caution if any of these apply to you: Bleeding disorders (may have anticoagulant effects); Kidney disease or history of calcium-oxalate kidney stones (chaga is very high in oxalates).
Shiitake
Too few graded studiesA culinary mushroom containing lentinan and eritadenine. Human evidence is limited to small RCTs — preliminary immune signals and a modest triglyceride effect, with no large trials or meta-analyses.
Turkey Tail
Mostly mechanism / observationalMedicinal mushroom whose extracts PSK and PSP are used alongside cancer treatment in Japan and China. Meta-analyses found a modest survival benefit in cancer patients, with little human data outside cancer care.
Reishi
Mostly mechanism / observationalA traditional calming mushroom rich in beta-glucans and triterpenes. The honest verdict: most evidence is preclinical or review-level; human RCTs are few, small, and mixed, and Cochrane found insufficient evidence for cancer or cardiovascular use.
Tremella
Mostly mechanism / observationalA culinary mushroom whose polysaccharides hold a lot of water in the lab. The honest verdict: the popular skin-hydration claims rest on mechanism, not human trials — there are no skin-outcome RCTs, only a couple of small cognition studies.
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Reviewed by Dr. Baher Al Hakim · Last reviewed May 2026 · evidence from 25 studies · how we score · editorial policy
This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.
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