Triterpenes and beta-glucans do different work
Reishi (Ganoderma lucidum) carries two main classes of actives. The triterpenes, including the bitter ganoderic acids, are linked to its calming and reputed liver and blood-pressure effects, while the beta-glucan polysaccharides are the immune-interacting fraction. A reishi extract's profile depends heavily on whether it is made from the fruiting body or mycelium and on how it is extracted, since triterpenes and polysaccharides need different solvents to pull out.
Adaptogen, immune modulation and sleep
Reishi is classed as an adaptogen, a loose category for plants thought to help the body buffer stress. Its beta-glucans are recognised by innate immune receptors and described as immune-modulating, meaning the response is tuned rather than simply amplified. The traditional use for sleep and calm has some small-trial support for sleep quality and fatigue, but the evidence base is limited and varied.
Reishi can interact with anticoagulants and immune-affecting drugs and is not a treatment for any disease. This is general educational information, not medical advice; consult a qualified clinician before use.