Reishi (Ganoderma lucidum) contains over 400 bioactive compounds—including triterpenoids, polysaccharides, and peptides—that help fight inflammation, regulate immunity, reduce tumor growth, and protect organs like the liver and kidneys. In lab and animal studies, reishi extracts suppressed cancer cell growth, blocked allergic reactions, and lowered oxidative stress, backing its long-standing use in traditional medicine with modern pharmacological proof.