# Chaga (Inonotus obliquus)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/chaga
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-04-04
**Evidence Score:** 2 / 10
**Category:** European
**Also Known As:** Inonotus obliquus, King of Herbs, Birch Conk, Sterile Conk Trunk Rot, Clinker Polypore, Black Mass, Chaga Conk, Birch Canker, Tschaga, Czaga

## Overview

Chaga (Inonotus obliquus) is a parasitic fungus growing on birch trees whose primary bioactive compounds, betulinic acid and polysaccharide beta-glucans, modulate [immune function](/ingredients/condition/immune-support) by activating macrophages and natural killer cells. Its exceptionally high superoxide dismutase (SOD) content also contributes to potent [antioxidant activity](/ingredients/condition/antioxidant), distinguishing it from most other medicinal mushrooms.

## Health Benefits

• [Immune function](/ingredients/condition/immune-support) support - Early 1950 Asian clinical trial reportedly confirmed improvement, leading to official medical recognition in Russia by 1955 (limited evidence quality)
• Potential anticancer properties - 1958 Finnish/Russian study suggested benefits for breast, liver, uterine, and gastric cancers (no study design details available)
• Psoriasis management - 1973 Russian journal reported benefits of Chaga extract (Vestnik Dermatologii i Venerologii, no PMID available)
• Gastrointestinal support - Traditional use for gastritis, ulcers, and digestive issues (traditional evidence only)
• [Anti-inflammatory](/ingredients/condition/inflammation) effects - Traditional use by North American Cree and Gitksan peoples for pain and inflammation (traditional evidence only)

## Mechanism of Action

Chaga's [beta-glucan](/ingredients/condition/immune-support)s bind to Dectin-1 and CR3 receptors on innate immune cells, triggering NF-κB signaling pathways that upregulate cytokine production including TNF-α and interleukin-6, thereby enhancing macrophage and NK cell activity. Betulinic acid, derived from the birch host tree and concentrated in chaga's outer sclerotium, inhibits topoisomerase I and induces [mitochondrial](/ingredients/condition/energy) apoptosis in certain cancer cell lines via cytochrome c release and caspase-3 activation. Additionally, inotodiol and ergosterol peroxide have demonstrated inhibition of COX-2 enzyme activity, providing a molecular basis for observed [anti-inflammatory](/ingredients/condition/inflammation) effects.

## Clinical Summary

Human clinical evidence for chaga remains sparse and methodologically limited; the most cited evidence comes from a 1958 Finnish and Russian observational study suggesting symptomatic improvement in patients with breast, liver, uterine, and gastric cancers, though this lacked rigorous controls and quantified endpoints. A 1950s Soviet clinical trial reportedly demonstrated [immune function](/ingredients/condition/immune-support) improvement sufficient for Russia's Ministry of Health to grant chaga official drug status in 1955, but the original data has not been independently replicated in peer-reviewed trials. More recent preclinical work—primarily in murine models and in vitro cell cultures—shows statistically significant tumor growth inhibition and [cytokine](/ingredients/condition/inflammation) modulation, but these findings cannot be directly extrapolated to human dosing or outcomes. Overall, the current evidence is classified as preliminary to insufficient for most therapeutic claims, and large-scale randomized controlled trials in humans are absent.

## Nutritional Profile

Chaga (Inonotus obliquus) is a fungal sclerotium with a distinctive nutritional and phytochemical profile. Macronutrients are modest: protein content approximately 2-8% dry weight (containing essential amino acids including leucine, valine, and threonine), carbohydrates 25-35% dry weight (predominantly complex polysaccharides including [beta-glucan](/ingredients/condition/immune-support)s estimated at 2-8% dry weight), fat content low at approximately 1-2% dry weight. Fiber content substantial at 10-15% dry weight. Key bioactive compounds: Betulinic acid and betulin (derived from birch bark host, typically 5-10 mg/g dry weight) - notable for proposed cytotoxic properties, though oral bioavailability is limited due to poor water solubility; Inotodiol (lanostane-type triterpenoid, approximately 0.5-2 mg/g); Ergosterol (provitamin D2 precursor, approximately 0.1-0.5 mg/g); Melanin complex (chromogenic compounds, high concentration 20-30% of sclerotium mass, contributes strong [antioxidant activity](/ingredients/condition/antioxidant)); Polyphenols and flavonoids (total phenolic content estimated 25-50 mg gallic acid equivalents per gram dry weight, among the highest recorded in natural substances); SOD-like (superoxide dismutase) enzyme activity reported at 35,000-40,000 units per gram. Minerals present include potassium (approximately 3,000-7,000 mg/kg dry weight), rubidium, cesium, and manganese at trace levels. Vitamins: B2 (riboflavin) and B3 (niacin) present in small quantities (<1 mg/100g). Oxalate content is notably high (approximately 1,000-5,000 mg/100g dry weight), significantly limiting mineral bioavailability and posing risk for oxalate-sensitive individuals. Hot water extraction (tea preparation) enhances polysaccharide and melanin bioavailability; alcohol extraction favors betulinic acid and triterpenoid recovery. Dual extraction methods recommended to capture full spectrum of compounds.

## Dosage & Preparation

Clinically studied dosage ranges are not detailed in available research. Traditional preparations involve decoctions (tea) from simmered conks or powders, while modern products often use hot water extracts standardized to 20-30% [beta-glucan](/ingredients/condition/immune-support)s, though specific doses were not quantified in studies. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Chaga's oxalate content is notably high, and prolonged daily consumption has been linked to oxalate nephropathy; a documented 2020 case report described a Japanese patient developing kidney injury after consuming chaga tea daily for six months. Chaga possesses antiplatelet and anticoagulant properties mediated partly by its polysaccharide fraction, creating a clinically relevant interaction risk with warfarin, heparin, aspirin, and other anticoagulant or antiplatelet drugs. It may also lower [blood glucose](/ingredients/condition/weight-management) levels, warranting caution in individuals on insulin or oral hypoglycemic agents due to additive hypoglycemic risk. Safety data in pregnant or breastfeeding women is absent, and use is not recommended during pregnancy; individuals with autoimmune conditions should consult a physician before use due to immune-stimulating activity.

## Scientific Research

Human clinical evidence for Chaga is extremely limited, with no large-scale RCTs or meta-analyses identified. The available studies include early Soviet-era research from the 1950s-1970s lacking modern methodological rigor, with no PMIDs available for any studies cited.

## Historical & Cultural Context

Chaga has been used for centuries in Russian, Siberian, and Indigenous North American folk medicine, with evidence dating to Ötzi the Iceman (3300 BCE) and Chinese pharmacopoeia (2696 BCE) calling it the 'King of Herbs.' Traditional applications included treatment of cancer, tuberculosis, gastritis, ulcers, and liver conditions, with Khanty people using it for detoxification since the 12th century.

## Synergistic Combinations

Reishi, Turkey Tail, Cordyceps, Vitamin D3, Astragalus

## Known Interactions

| Substance | Severity | Summary | URL |
|---|---|---|---|
| Omega-3 Fish Oil | SAFE | 🟢 SAFE — Chaga and Omega-3 Fish Oil can be taken together safely. | https://ingredients.hermeticasuperfoods.com/interactions/omega-3-fish-oil |
| Melatonin | SAFE | 🟢 SAFE — Chaga and Melatonin can be taken together safely. | https://ingredients.hermeticasuperfoods.com/interactions/melatonin |
| Collagen | SAFE | 🟢 SAFE — Chaga and Collagen can be taken together safely. | https://ingredients.hermeticasuperfoods.com/interactions/collagen |
| Probiotics | SAFE | 🟢 SAFE — Chaga and Probiotics can be taken together safely. | https://ingredients.hermeticasuperfoods.com/interactions/probiotics |
| CoQ10 | SAFE | 🟢 SAFE — Chaga and CoQ10 can be taken together safely. | https://ingredients.hermeticasuperfoods.com/interactions/coq10 |
| 50 | SAFE | 🟢 SAFE — Chaga and Quercetin can be taken together safely. | https://ingredients.hermeticasuperfoods.com/interactions/50 |
| Turkey Tail | SAFE | 🟢 SAFE — Chaga and Turkey Tail can be taken together safely. | https://ingredients.hermeticasuperfoods.com/interactions/turkey-tail |
| Turmeric | SAFE | 🟢 SAFE — Chaga and Turmeric can be taken together safely. | https://ingredients.hermeticasuperfoods.com/interactions/turmeric |
| Ginger | SAFE | 🟢 SAFE — Chaga and Ginger can be taken together safely. | https://ingredients.hermeticasuperfoods.com/interactions/ginger |
| Black Seed Oil | SAFE | 🟢 SAFE — Chaga and Black Seed Oil can be taken together safely. | https://ingredients.hermeticasuperfoods.com/interactions/black-seed-oil |
| Tongkat Ali | SAFE | 🟢 SAFE — Chaga and Tongkat Ali can be taken together safely. | https://ingredients.hermeticasuperfoods.com/interactions/tongkat-ali |
| Fenugreek | SAFE | 🟢 SAFE — Chaga and Fenugreek can be taken together safely. | https://ingredients.hermeticasuperfoods.com/interactions/fenugreek |
| Saw Palmetto | SAFE | 🟢 SAFE — Chaga and Saw Palmetto can be taken together safely. | https://ingredients.hermeticasuperfoods.com/interactions/saw-palmetto |
| Valerian Root | SAFE | 🟢 SAFE — Chaga and Valerian Root can be taken together safely. | https://ingredients.hermeticasuperfoods.com/interactions/valerian-root |
| St. Johns Wort | SAFE | 🟢 SAFE — Chaga and St. Johns Wort can be taken together safely. | https://ingredients.hermeticasuperfoods.com/interactions/st-johns-wort |
| Ginkgo Biloba | SAFE | 🟢 SAFE — Chaga and Ginkgo Biloba can be taken together safely. | https://ingredients.hermeticasuperfoods.com/interactions/ginkgo-biloba |
| Milk Thistle | SAFE | 🟢 SAFE — Chaga and Milk Thistle can be taken together safely. | https://ingredients.hermeticasuperfoods.com/interactions/milk-thistle |
| Echinacea | SAFE | 🟢 SAFE — Chaga and Echinacea can be taken together safely. | https://ingredients.hermeticasuperfoods.com/interactions/echinacea |
| Elderberry | SAFE | 🟢 SAFE — Chaga and Elderberry can be taken together safely. | https://ingredients.hermeticasuperfoods.com/interactions/elderberry |
| Berberine | SAFE | 🟢 SAFE — Chaga and Berberine can be taken together safely. | https://ingredients.hermeticasuperfoods.com/interactions/berberine |

## Frequently Asked Questions

### What is the recommended dosage of chaga mushroom extract?

No standardized human clinical dosage has been established through controlled trials. Traditional and commercial preparations typically range from 1,000–2,000 mg per day of dried extract, or 1–3 cups of chaga tea brewed from 3–5 grams of raw sclerotium. Extracts standardized to at least 30% polysaccharides are generally preferred, but optimal dosing remains unvalidated by rigorous human data.

### Can chaga mushroom interact with blood thinners like warfarin?

Yes, chaga contains polysaccharides with documented antiplatelet activity that can potentiate the effects of anticoagulants such as warfarin and antiplatelets such as aspirin or clopidogrel, increasing bleeding risk. Patients on these medications should avoid chaga supplementation without direct physician supervision and INR monitoring. This interaction is considered pharmacodynamic rather than metabolic and is not dependent on CYP450 enzyme pathways.

### Does chaga mushroom have anticancer properties in humans?

Current human evidence is limited to outdated observational reports from the 1950s, including a Finnish-Russian study suggesting benefit for breast, liver, uterine, and gastric cancers, which lacked controlled methodology. In vitro studies confirm that betulinic acid and inotodiol induce apoptosis in cancer cell lines, and murine studies show tumor growth inhibition, but no modern randomized controlled trials in human cancer patients exist. Chaga should not be used as a substitute for conventional oncological treatment based on available evidence.

### Is chaga mushroom safe to take every day long-term?

Daily long-term use carries a meaningful risk of oxalate accumulation due to chaga's high oxalate content, which has caused documented cases of kidney injury, including at least one confirmed case of oxalate nephropathy after six months of daily tea consumption. Individuals with a history of kidney stones, impaired renal function, or conditions predisposing to hyperoxaluria are at elevated risk. Cycling use—such as 8 weeks on, 2–4 weeks off—is a common precautionary practice, though no formal safety protocols have been established clinically.

### What makes chaga different from other medicinal mushrooms like reishi or lion's mane?

Chaga is unique among medicinal mushrooms in that it is technically a parasitic sclerotium rather than a fruiting body, and it accumulates betulinic acid directly from its birch host, a compound not significantly present in reishi or lion's mane. It also contains one of the highest recorded ORAC (Oxygen Radical Absorbance Capacity) values among natural foods, driven largely by melanin pigments and superoxide dismutase activity. Reishi is more strongly associated with adaptogenic triterpenes (ganoderic acids) and lion's mane with nerve growth factor (NGF) stimulation via hericenones and erinacines, representing distinct mechanistic profiles.

### Is chaga mushroom safe during pregnancy and breastfeeding?

There is insufficient clinical evidence to establish the safety of chaga supplementation during pregnancy or breastfeeding, so it is generally recommended to avoid use during these periods unless directed by a healthcare provider. Chaga's bioactive compounds, including polysaccharides and betulinic acid, may cross the placental barrier or enter breast milk, but specific effects on fetal development or infant health have not been formally studied. Pregnant or nursing women should consult with their healthcare provider before supplementing.

### What is the difference between chaga tea, powder, and liquid extract forms?

Chaga tea and water decoctions are prepared by simmering raw or dried chaga chunks and may contain fewer concentrated bioactive compounds compared to standardized extracts. Chaga powders vary widely in potency depending on the extraction method used (water-based versus dual extraction with alcohol), which affects bioavailability of beta-glucans and other polysaccharides. Liquid extracts and tinctures typically offer higher concentrations of active compounds and faster absorption, though they are more expensive and may contain alcohol, making powders and tea more accessible for daily use.

### How strong is the scientific evidence supporting chaga's traditional health claims?

While chaga has a long history of use in Russian and Scandinavian traditional medicine, the clinical evidence supporting its benefits remains limited and often lacks modern study design standards; many cited studies from the 1950s–1970s lack detailed methodology documentation. In vitro and animal studies show promise for immune-modulating and antioxidant properties, but large-scale, placebo-controlled human trials are sparse, making it difficult to definitively confirm efficacy for cancer prevention, immune support, or other claimed benefits. Current research suggests chaga warrants further investigation, but consumers should view traditional claims with appropriate caution until more rigorous clinical evidence emerges.

## Hermetica Products Containing Chaga (Inonotus obliquus)

- **[Eternity](https://hermeticasuperfoods.com/products/eternity)** — Functional mushroom gummies — Lion's Mane, Reishi, Cordyceps, Chaga & Maitake.

> [hermeticasuperfoods.com](https://hermeticasuperfoods.com)

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*Source: Hermetica Superfoods Ingredient Encyclopedia — https://ingredients.hermeticasuperfoods.com*
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