Mushroom polysaccharides, particularly beta-glucans, are among the most extensively studied compounds found in medicinal mushrooms. Laboratory, animal and human studies suggest they may interact with the immune system in several ways, although the exact mechanisms and clinical significance continue to be investigated.
Immune Modulation
Rather than simply "boosting" the immune system, mushroom beta-glucans appear to help modulate immune activity. Research suggests they can interact with immune cells such as macrophages, dendritic cells and natural killer (NK) cells, helping to regulate aspects of the body's innate immune response.
Cytokine Signalling
Beta-glucans have been shown in experimental studies to influence the production of cytokines, the signalling molecules that help coordinate communication between immune cells. This may contribute to a balanced and appropriate immune response.
Antioxidant Activity
Some mushroom polysaccharides demonstrate antioxidant activity, helping to reduce oxidative stress caused by free radicals. Since oxidative stress can affect normal immune function, this may represent an indirect mechanism by which these compounds support overall health.
Phagocytosis
Research suggests that certain beta-glucans may enhance phagocytosis, the process by which specialised immune cells engulf and remove foreign particles, damaged cells and microorganisms.
Supporting Normal Immune Function
By interacting with multiple components of the innate immune system, mushroom polysaccharides have attracted considerable scientific interest for their potential role in supporting normal immune function. However, the effects observed can vary depending on the mushroom species, extraction method, dosage and the population being studied.
Current State of the Evidence
Although a substantial body of research has investigated mushroom polysaccharides, particularly those derived from Trametes versicolor (formerly Coriolus versicolor), further high-quality clinical studies are still needed to fully understand their role in human health. Findings from laboratory and animal studies do not always translate directly to clinical outcomes in humans.
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