NAC has been demonstrated to relieve symptoms of chronic bronchitis and help clear excess mucus in the lungs in people with cystic fibrosis or chronic obstructive pulmonary disease (COPD). In addition, studies show NAC helps attenuate the severity and frequency of influenza-like symptoms and improve immunity.Recommended Dosage: Adults only: Take one (1) capsule daily with meals, or as directed by a health care practitioner.Caution: Consult a health care physician prior to use if you are pregnant, breastfeeding or have kidney stones. Do not use this product if you are taking antibiotics or nitroglycerin.