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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.
Before that, marshmallows were made from the roots of the mallow plant, a pink-flowered European perennial herb of the mallow family that is naturalized in the eastern U.S. As far back as ancient Egypt, people had squeezed the mallow root to make a sticky confection.