Synopsis

Source of validity: Traditional
Rating (out of 5): 2

Fungi, particularly certain medicinal mushrooms such as Ganoderma lucidum (Reishi), Lentinula edodes (Shiitake), and Cordyceps species, have been used in traditional medicine systems (notably Traditional Chinese Medicine and some folk practices) for the prevention and treatment of colds. The traditional rationale is that these fungi are thought to "strengthen the immune system" and thereby prevent common infections like colds. Historical texts and ethnobotanical records note their use for supporting general health and resilience against illness.

Modern scientific research provides limited support for these traditional uses. Some in vitro and animal studies suggest that certain fungal polysaccharides (notably beta-glucans) can modulate immune function. However, robust clinical evidence in humans for the prevention of the common cold is lacking. While some small trials or pilot studies have looked at immune markers or self-reported symptom reduction, the quality of evidence is generally low, with methodological limitations and inconsistent results. Major health organizations do not currently endorse fungi or mushroom extracts as a proven preventive measure for colds.

In summary, the use of medicinal fungi to prevent colds is primarily justified by tradition, with some weak preliminary scientific indications but insufficient high-quality evidence to recommend their use for this purpose.

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