What Is Chaga Tea? | A Mushroom Brew, Not A True Tea

Chaga tea is a dark, earthy beverage made by steeping chunks of the chaga mushroom in hot water, valued for antioxidants rather than caffeine.

If you are wondering what is chaga tea, the short version is this: it’s a traditional herbal drink brewed from the *Inonotus obliquus* fungus, which grows on birch trees in cold climates. Unlike black or green tea, it contains no caffeine and no tea-plant leaves. People boil the hard, charcoal-like chunks to make a deep brown brew with a mild, vanilla-like, earthy flavor. For a closer look at the best-rated products on the market, see our tested roundup of the best chaga tea options.

What Exactly Is Chaga?

Chaga is not a mushroom in the typical sense. It is a sterile fungal growth, called a conk, that forms on the outside of birch trees. The inside is a tough, cork-like mass that people harvest, dry, and sell as chunks or grind into powder.

You will find chaga sold in several forms, including:

• Dried mushroom chunks for boiling into tea
• Fine powder that dissolves directly in hot water
• Tinctures and fluid extracts for adding to drinks

The brewing process is simple. Simmer a few chunks in water for an hour or more, then strain. Powder and extract versions need only a quick stir into hot water.

Health Benefits: What The Evidence Shows

Chaga tea has a strong reputation as a wellness drink, but the science is thinner than the marketing suggests. According to Memorial Sloan Kettering Cancer Center, the safety and effectiveness of chaga have simply not been evaluated in clinical studies. That means most claims about its power come from test-tube research and traditional use, not human trials.

The main reasons people drink it are the antioxidants, which help fight cell damage, and a compound called betulinic acid, which has been studied for its anti-inflammatory properties. That research is promising but preliminary, and no one has proven that drinking tea delivers those benefits in meaningful amounts.

Are There Risks Or Side Effects?

Yes, and they deserve attention before you brew your first pot. The British Columbia Centre for Disease Control has reported five cases of illness since 2014 potentially linked to commercially sourced chaga tea, including hepatitis, kidney failure, and dangerously slow heart rate with vomiting and low blood pressure.

The biggest concerns fall into three categories:

• Oxalates. Chaga is high in these compounds, which can contribute to kidney stones and, in rare cases, kidney injury. People with a history of stones should be cautious.
• Bleeding risk. MSKCC warns that chaga may increase bleeding risk when taken with warfarin and similar blood thinners. Its potential to affect blood clotting makes it a questionable choice before surgery.
• Blood sugar. Chaga may lower blood sugar, which sounds good but can be dangerous if you take diabetes medication and end up with levels that drop too low.

There is also essentially no safety data for pregnant or breastfeeding women, so the cautious move is to avoid it during those periods. If you want to try it anyway, .

Does It Taste Like Regular Tea?

Not at all. Where black tea is bitter and brisk, chaga is mellow and slightly sweet, with notes of vanilla, coffee, and leather. It brews up dark brown, almost like a weak coffee, but contains no caffeine, so it will not keep you awake at night.

People who dislike it usually cite the earthy, woody aftertaste. People who love it say the flavor is an acquired pleasure, helped along by a spoonful of honey or a splash of oat milk.

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