Adult 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*Digestive system—helps to restore the balance of good bacteria in the digestive tract and to maintain healthy immune function*KEY INGREDIENTSAdult Sinus Support™ ingredients are supported by thousands of years of tradition and backed by science to support healthy sinus, bronchial, & immune function.*Vitamin C promotes a normal histamine response and healthy immune function.*Quercetin has been shown to promote normal histamine levels in the body.*N-Acetyl Cysteine thins mucus secretions of the lungs and bronchial system.*Bioflavonoids promote a normal inflammatory response in the sinus cavities and healthy immune