Promotes Healthy Sinus Cavaties and Supports the Immune System. Children’s Sinus Support addresses the 3 body systems involved in sinus and bronchial health: Immune system modifies the release of histamine, which results in normal mucosal secretions and healthy immune function; Respiratory system works to balance the function of the sinus and bronchial systems and clears and soothes the mucus membranes of the sinuses and the lungs; and Digestive system helps to restore the balance of good bacteria in the digestive tract and to maintain healthy immune function.