Synopsis

Source of validity: Traditional
Rating (out of 5): 1

Lichens have a long history of use in traditional medicine systems across various cultures for treating respiratory ailments, including symptoms associated with influenza such as cough, sore throat, and fever. Species such as Usnea (commonly known as "Old Man's Beard") and Cetraria islandica (Iceland moss) have been used in European and Asian herbal traditions for their purported soothing, antimicrobial, and immunomodulatory effects. However, the use of lichens specifically for influenza is rooted primarily in folklore and empirical, historical practices rather than robust scientific research.

Scientific studies investigating the antiviral properties of lichens are limited and largely preliminary. Some in vitro research has identified various lichen metabolites (such as usnic acid) with antimicrobial or weak antiviral effects, but clinical trials demonstrating efficacy against influenza viruses in humans are lacking. The evidence for lichen use against influenza, therefore, is based mainly on traditional use rather than validated pharmacological data. As such, while lichens are historically used to support respiratory health, there is insufficient scientific evidence to recommend them as an effective treatment or preventive measure for influenza.

More about lichen
More about Influenza

Other ingredients used for Influenza

Other health conditions supported by lichen

Products containing lichen