Herbs & Botanicals

Usnea / Old Man’s Beard Lichen (Usnea spp.): Traditional Use, Usnic Acid, Research & Liver Safety
Usnea is a genus of fruticose beard lichens with a long traditional-use history and genuine antimicrobial chemistry, especially around the lichen metabolite usnic acid. This guide explains lichen identity, identification, traditional use, the limits of modern evidence, and the serious liver-safety history of concentrated oral usnic acid. Read more...