Evidence supporting the use of: Lichen
For the health condition: Infection (viral)

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Synopsis

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

Lichens have a long history of use in traditional medicine systems, including in Europe, Asia, and North America, for a variety of ailments such as wounds, respiratory issues, and infections. Several species of lichen—most notably Usnea spp. (commonly called “Old Man’s Beard”)—have been used in ethnomedicine to treat infections, and occasionally viral illnesses such as colds or influenza. The traditional basis for this use often stems from the perceived antiseptic or antimicrobial properties of lichen extracts. Usnic acid, a major secondary metabolite found in many lichens, has been found in laboratory studies to possess antimicrobial and some antiviral activities 1. However, most of the scientific research has focused on antibacterial rather than antiviral effects, and there is limited clinical evidence supporting the efficacy of lichens in treating viral infections in humans.

While some in vitro studies have demonstrated that certain lichen compounds can inhibit viral replication (e.g., herpes simplex virus, influenza virus) in cell cultures, these findings have not translated into substantial clinical or in vivo evidence. Therefore, while the use of lichen for viral infections is justified by traditional use and some preliminary scientific findings, robust human trials are lacking. Caution is also advised due to potential toxicity (notably with usnic acid) if consumed in large amounts.

1. Cocchietto, M. et al., “A review on usnic acid, an interesting natural compound,” Natural Product Research, 2002.

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Products containing Lichen

We currently have no products on Vitabase that contain this ingredient.