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Chaga mushroom

Uses, health benefits, safety, and side effects

Chaga mushrooms have been used for centuries in some parts of the world to boost immunity and health. This article examines the uses, benefits, and potential side effects of chaga mushrooms.

This article is based on scientific evidence, written by experts, and fact-checked by experts.
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Chaga mushroom: Uses, benefits, safety, and side effects
Last updated on June 16, 2023, and last reviewed by an expert on August 15, 2022.

Chaga mushrooms have been used for centuries in Siberia and other parts of Asia as a medicine to boost immunity and improve overall health.

Chaga mushroom: Uses, benefits, safety, and side effects

Though ugly, the chaga mushroom is gaining popularity in the Western world for its potential health benefits.

Moreover, a cup of tea made from chaga is packed with antioxidants.

However, consumption of this extraordinary mushroom may come with some risks.

This article examines the uses, benefits, and potential side effects of chaga mushrooms.

In this article

What are chaga mushrooms?

Chaga mushroom (Inonotus obliquus) is a fungus growing mainly on the bark of birch trees in cold climates, such as Northern Europe, Siberia, Russia, Korea, Northern Canada, and Alaska.

Chaga is also known by other names, such as black mass, clinker polypore, birch canker polypore, cinder conk, and the sterile conk trunk rot (of birch).

Chaga produces a woody growth, or conk, which looks similar to a clump of burnt charcoal — roughly 10–15 inches (25–38 centimeters) in size. However, the inside reveals a soft core with an orange color.

For centuries, chaga has been used as a traditional medicine in Russia and other Northern European countries, mainly to boost immunity and overall health.

It has also been used to treat diabetes, certain cancers, and heart disease.

Traditionally, chaga was grated into a fine powder and brewed as an herbal tea.

Nowadays, it’s not only available as a tea but also as a powdered or capsuled supplement. The tea may feature chaga alone or in combination with other mushrooms, such as cordyceps.

Taking chaga with either warm or cold water is believed to release its medicinal properties.

Remember that reliable information on chaga’s nutritional content is extremely limited.

That said, they’re low in calories, very high in fiber and loaded with antioxidants.

Summary: Chaga mushroom is a fungus that grows primarily on birch trees in cold climates. With an appearance similar to burnt charcoal, it has been harvested for centuries as traditional medicine.

Potential health benefits of chaga mushrooms

Though research is ongoing, some scientific studies indicate that chaga extract may provide certain health benefits.

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Chaga mushrooms can Boost your immune system and fights inflammation

Inflammation is a natural response of your immune system that can protect against disease. However, long-term inflammation is linked to heart disease and rheumatoid arthritis.

Animal and test-tube studies suggest that chaga extract can positively impact immunity by reducing long-term inflammation and fighting harmful bacteria and viruses.

By promoting the formation of beneficial cytokines — specialized proteins that regulate the immune system — chaga stimulates white blood cells, which are essential for fighting harmful bacteria or viruses.

As a result, this mushroom could help fight infections — from minor colds to severe illnesses.

Other animal and test-tube studies demonstrate that chaga can prevent the production of harmful cytokines, which trigger inflammation and are associated with the disease.

For example, in a study in mice, chaga extract reduced inflammation and gut damage by inhibiting inflammatory cytokines.

Chaga mushrooms may prevent and fight cancer

Several animal and test-tube studies show that chaga can prevent and slow cancer growth.

In a study in mice with cancer, chaga supplements resulted in a 60% reduction in tumor size.

In a test-tube study, chaga extract prevented cancer growth in human liver cells. Similar results were observed with lung, breast, prostate, and colon cancer cells.

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It’s thought that the anticancer effect of chaga is partly due to its high content of antioxidants, which protect cells from damage by free radicals.

In particular, chaga contains the antioxidant triterpene. Test-tube studies reveal that very concentrated triterpene extract can help kill cancer cells.

Remember that human studies are needed to make valid conclusions about chaga’s anticancer potential.

Chaga mushrooms can lower blood sugar

Several animal studies link chaga to lower blood sugar levels. Therefore, it may help manage diabetes.

A recent study in obese, diabetic mice observed that chaga extract reduced blood sugar levels and insulin resistance compared to diabetic mice who did not receive the supplement.

In another study in diabetic mice, chaga supplements led to a 31% decrease in blood sugar levels over three weeks.

Similar results have been seen in other studies.

However, as human research is unavailable, it’s unclear whether chaga can help manage diabetes in humans.

Chaga mushrooms may lower cholesterol

Chaga extract may also benefit cholesterol levels, reducing your risk of heart disease.

In an eight-week study in rats with high cholesterol, chaga extract reduced “bad” LDL cholesterol, total cholesterol, and triglycerides while increasing antioxidant levels.

Similar studies gave the same results and observed that — in addition to reducing “bad” LDL cholesterol — chaga increases “good” HDL cholesterol.

Researchers believe that the antioxidants present in chaga are responsible for its effects on cholesterol.

Again, more research on humans is needed to clearly understand chaga’s cholesterol impact.

Summary: Animal and test-tube studies found that chaga extract may boost immunity, prevent chronic inflammation, fight cancer, lower blood sugar levels, and reduce cholesterol. However, more human studies are needed.

Safety and side effects of chaga mushrooms

Chaga is generally well-tolerated. However, no human studies have been conducted to determine its safety or appropriate dosage.

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Chaga can interact with some common medications, causing potentially harmful effects.

For example, chaga could pose risks for people with insulin or diabetes due to its impact on blood sugar.

Chaga also contains a protein that can prevent blood clotting. Therefore, if you are on blood-thinning medications, have a bleeding disorder, or are preparing for surgery, consult with your doctor before taking chaga.

Though some research shows that chaga may help reduce inflammation, it may also cause your immune system to become more active. Thus, people with autoimmune diseases should seek medical advice before taking chaga.

There is no research on the safety of chaga for pregnant or breastfeeding women. Therefore, the safest option is to avoid use.

Finally, remember to buy supplements from reputable sources, as chaga is not monitored by the FDA.

Summary: No studies have analyzed the safety or appropriate dosage of chaga. Unwanted side effects could occur if you have a bleeding disorder or autoimmune disease, take blood thinners or are pregnant or breastfeeding.


For centuries, people have used chaga mushrooms for medicinal purposes.

Packed with antioxidants, chaga mushroom is available in tea or supplement form.

Its extract may fight cancer and improve immunity, chronic inflammation, blood sugar, and cholesterol levels.

Still, human studies are needed to confirm these benefits and to determine its safety, side effects, and optimal dosage.

If you’re interested in trying chaga mushroom tea or supplement but have concerns about side effects or possible interactions with medications you’re taking, talk to your doctor first.

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