Soothes the mucous lining of the airways. Promotes gastrointestinal health. Swanson Marshmallow Root is nature's perfect solution for respiratory and gastrointestinal comfort! For hundreds of years, herbalists have relied on marshmallow root to support the respiratory and gastrointestinal systems, and for good reason. Marshmallow root's rich mucilage content makes it an excellent choice for softening the mucous membranes that line the respiratory tract and gastrointestinal tract. Our convenient 500mg capsules make it easy to enjoy the calming benefits of this time honored herb.