Usnea Lichen (Usnea species) can be found in cool, damp place worldwide. Usnea lichen can be found in white, black and red varieties on an assortment of trees. The plant body can be used medicinally. It contains a variety of lichen acids including usnic acid, thamnolic acid, labaric acid, stictinic acid, evernic acid, barbatic acid, diffractaic acid, and protocetraric acid. Usnea has shown anti-inflammatory, analgesic, antipyretic, antibacterial, antiviral, and antifungal activities. It has been used as an expectorant. for weight loss, pain relief, fever control, and wound healing.
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