Glutathione have you heard of it? A little research & you will learn like I did. Symptoms if your glutathione may be low: Feeling run down or low energy Getting sick more Frontiers Glutathione: A Samsonian life sustaining small molecule that protects against oxidative stress, ageing and damaging inflammation Glutathione CHEST Lung glutathione and oxidative stress: implications in cigarette smoke induced airway disease American Journal of Physiology Lung Cellular and Molecular Physiology American Physiological Society Amazon.com: DAVINCI Laboratories N Acetyl Cysteine 500 mg an Amino Acid Supplement to Support Immune System Function and Lung Health Vegetarian, Gluten Free 90 Capsules : Health & Household NAC Supplement N Acetyl Cysteine 600mg per Serving Vegan High Absorption Non Smelly NAC Capsules Glutathione for Liver Support plus Lung Health and