Dietary Supplement. Respiratory Health. Lung, Bronchial & Sinus Health is a natural source formula designed to nourish and support the entire respiratory system. Isura®: Verified Clean, Non-GMO. The ISURA® seal is your assurance that this product is independently verified as clean and safe, and has been tested for up to 800 possible contaminants. ISURA's rigorous testing includes hundreds of quality procedures using state-of-the-art technology. It provides you with the confidence that this product is ISURA verified clean, one of the highest testing standards in the world. Natural Factors, Lung, Bronchial & Sinus Health, 45 Tablets. Dietary Supplement. Respiratory Health. Lung, Bronchial & Sinus Health is a natural source formula designed to nourish and support the entire respiratory system. Isura™: Non-GMO: Documentation ✔ Mass Spec: Lab Tested ✔