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Marshmallow is most commonly used to ease sore throats and dry coughs. The Marshmallow plant, especially the leaves and roots, contains polysaccharides that have antitussive, mucilaginous, and antibacterial properties.
The herb is found the US southwest, and is used to treat arthritis pain. Plant Parts & Active Compounds: Herb. Ephedrine and pseudoephedrine. History and uses: No longer used in the puffy white candy that bears it's name, marshmallow is known primarily for alleviating sore throats and other ailments.