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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.
History. Originally, however, marshmallows were made from the root sap of the marsh mallow (Althaea officinalis) plant. It is a genus of herb that is native to parts of Europe, north Africa, and Asia. Marsh mallows grow in marshes and other damp areas.The plant has a fleshy stem, leaves, and pale, five-petaled flowers.riginally, however, marshmallows were made from the root sap of the marsh mallow (Althaea officinalis) plant. It is a genus of herb that is native to parts of Europe, north Africa, and Asia.