Chaga is a fungus that grows on tree trunks, especially birch trees. It produces a woody growth, called a conk, which absorbs nutrients from the wood.

Chaga might stimulate the immune system. It contains some chemicals that have antioxidant effects, and might lower blood sugar and cholesterol levels.

People use chaga for conditions such as heart disease, diabetes, cancer, and others, but there is no good scientific evidence to support these uses.

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