Reishi is the most revered medicinal mushroom in traditional Chinese medicine ("The Mushroom of Immortality") with moderate evidence for immune modulation and emerging evidence for sleep and anxiety support. Our research shows it reliably modulates immune function — enhancing NK cell activity and cytokine profiles in cancer patients — but a 2016 Cochrane review found insufficient evidence to recommend reishi as a first-line cancer treatment. The hepatotoxicity signal (powdered reishi caused liver injury in case reports) means quality and form matter significantly.
Reishi contains two pharmacologically distinct compound classes: (1) polysaccharides (primarily beta-glucans) — which activate immune cells (macrophages, NK cells, dendritic cells) through pattern recognition receptors (Dectin-1, TLR-2), enhancing innate immune surveillance; and (2) triterpenes (ganoderic acids) — which are anti-inflammatory (NF-κB inhibition), hepatoprotective at moderate doses but hepatotoxic at high doses, and bind GABA-A receptors (calming/sleep effect). Dual extraction (hot water + alcohol) captures BOTH compound classes — water alone misses triterpenes, alcohol alone misses polysaccharides.
Reviewed by the Scan Dose Research Team and Clinical Advisory Board | Last updated:
Not medical advice. Based on published clinical research and systematic reviews.