Reishi (Ganoderma lucidum) is a medicinal mushroom used in East Asian traditions. Its key compounds are triterpenes and polysaccharides, which support immune function and stress response.
People take reishi as a capsule, powder, or liquid extract. Taking it with food helps absorption. Dose depends on form, typically once or twice daily.
Reishi may thin the blood. Use caution if you take anticoagulant medications. Some people experience dizziness or dry mouth. Avoid during pregnancy and while breastfeeding.