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> Herbal Remedies > Usnea
USNEA
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Parts used and where grown: Usnea, also known as old man’s beard, is not a plant but a lichen—a symbiotic relationship between an algae and a fungus. The entire lichen is used medicinally. Usnea looks like long, fuzzy strings hanging from trees in the forests of North America and Europe, where it grows.  Usnea has been used in connection with the following conditions (refer to the individual health concern for complete information):
Historical or traditional use (may or may not be supported by scientific studies): Due to its bitter taste, usnea stimulates digestion and was historically used by herbalists to treat indigestion. It was also reportedly used over 3,000 years ago in ancient Egypt, Greece, and China to treat unspecified infections.1 Active constituents: Usnic acid gives usnea its bitter taste and also acts as an antibiotic in test tube studies.2 Test tube studies have suggested an anti-cancer activity for usnic acid. However, this action has not been sufficient to warrant further investigation in humans.3 Usnea also contains mucilage, which may be helpful in easing irritating coughs. Again, this has not been studied in humans. How much is usually taken? Usnea, 100 mg three times per day, can be taken in capsules.4 Tincture, 3–4 ml three times per day, can also be used. Are there any side effects or interactions? There are no known side effects of usnea. It is considered safe for use in children. The safety of usnea during pregnancy and breast-feeding has not been established. References: 
1. Tilford GL. Edible and Medicinal Plants of the West. Missoula, MT: Mountain Press Publishing Company, 1997, 148–9. 2. Weiss RF. Herbal Medicine. Beaconsfield, UK: Beaconsfield Publishers Ltd., 1988, 49. 3. Evans WC. Trease and Evans’ Pharmacognosy, 13th ed. London: Baillière Tindall, 1989, 643. 4. Gruenwald J, Brendler T, Jaenicke C, et al. (eds). PDR for Herbal Medicines. Montvale, NJ: Medical Economics, 1998, 1199–200. |
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Reliable
and relatively consistent scientific data showing a substantial health benefit.
Contradictory, insufficient, or preliminary studies
suggesting a health benefit or minimal health benefit.
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