Chaga (Inonotus obliquus) is the most powerful known source of antioxidants among mushrooms. It is an effective agent with pronounced anti-inflammatory, anti-tumor, and antiviral properties. It can be used as a base adaptogenic supplement during the cold season and when it is necessary to reduce the hypersensitivity of the immune system in response to external pathogenic factors. The bioactive components of Chaga can increase endurance during excessive physical and mental exertion and help speed up recovery after gym workouts.