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Chaga (scientific name: Inonotus obliquus) is an amazing medicinal mushroom that only grows in cold climates, and is most potent when exposed to temperatures under -40°F. That's why Siberian Chaga is the best Chaga you can buy.Siberian Chaga is the most powerful antioxidant in its class, and has the highest antioxidant concentration of any known natural food. Chaga grows in Siberia, Korea, Canada, the Northern US and parts of the Carolina mountains. But, because of the extremely cold temperatures encountered in the Siberian forest, Siberian Chaga is the most potent variety worldwide.