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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.
An open clinical trial examined a combination herbal cough syrup containing marshmallow root in 62 patients 16 to 89 years of age. Patients with irritating cough were diagnosed with a common cold (n = 29), bronchitis (n = 20), or respiratory tract diseases with formation of viscous mucus (n = 15).