Durotuss Lingering Cough + Immune Support, helps provide effective relief from a mild lingering cough generally associated with the common cold. Furthermore, it assists with a healthy immune system.This liquid contains marshmallow, an ingredient which has been traditionally used in Western herbal medicine to help soothe an irritated throat & dry cough caused by the irritated throat.Contains natural actives + Zinc to relieve a cough, soothe an irritated throat and support a healthy immune system.