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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.
Traditionally, marshmallows were made from the extract of the mucilaginous root of the marshmallow plant (Althaea officinalis) as a cough medicine. The inner bark of the slippery elm (Ulmus rubra), a North American tree species, has long been used as a demulcent and is still produced commercially for that purpose.