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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 often used in many lung preparations and cough syrups to alleviate a dry, hacking cough, whooping cough and laryngitis. As a cough suppressant, Marshmallow soothes the membranes, frequently inhibiting cough. The herb is also known to be a fine expectorant, helping to loosen and expel phlegm from the lungs.