Reishi: The Ancient Medicinal Mushroom with Limited Modern Evidence
Reishi (Ganoderma lucidum) has been revered in East Asian medicine for 2,000 years, but clinical evidence for its immune-boosting and cancer-fighting claims remains insufficient.
Reishi (*Ganoderma lucidum*), known as *líng zhī* in Chinese ("spirit plant"), is a shelf fungus used in traditional East Asian medicine for over 2,000 years. It has been associated with longevity, immune support, and stress resilience. ## Active Compounds - **Triterpenoids** (ganoderic acids): Anti-inflammatory and cytotoxic properties in laboratory studies - **Polysaccharides** (beta-glucans): Immunomodulatory, stimulate natural killer cells and macrophages - **Peptidoglycans**: Additional immune-modulating activity ## Clinical Evidence Laboratory and animal studies show immunomodulatory effects, but human clinical evidence is limited. A 2016 Cochrane review found insufficient evidence to recommend reishi as a cancer treatment adjunct. Some trials show modest improvements in immune parameters, but effect sizes are small and study quality variable. Reishi is classified as an adaptogen — a category that lacks standardized clinical definitions. Side effects are generally mild (digestive discomfort), though rare cases of liver toxicity have been reported with long-term, high-dose use of concentrated extracts. **See also:** Medicinal Mushrooms: Clinical Evidence vs Supplement Industry Hype