Ganoderma lucidum, commonly known as Reishi or Lingzhi, is a medicinal mushroom revered for over 2,000 years in traditional Asian medicine for promoting health, vitality, and longevity. Modern research indicates it contains over 400 bioactive compounds—primarily triterpenoids, polysaccharides, and peptidoglycans—that offer significant health benefits, particularly in immune modulation, cancer support, and reducing inflammation.