Abstract
Human studies on the anticancer and immunostimulating effects of chaga mushroom are needed. Chaga mushroom is found in several areas in the Northern Hemisphere, and has been used in folk medicine for various ailments. Laboratory and animal studies show that compounds in chaga can kill cancer cells selectively and stimulate the immune system. Chaga may also reduce fatigue and inflammation, and increase mental sharpness. However, clinical trials are needed to confirm safety and effectiveness for these uses. In addition, chaga may interact with some drugs and is high in oxalates, which may prevent the absorption of some nutrients and can be toxic in high doses.