Effect of high dose N acetylcysteine on exacerbations and lung function in patients with mild to moderate COPD: a double blind, parallel group, multicentre randomised clinical trial Nature Communications Frontiers Glutathione: A Samsonian life sustaining small molecule that protects against oxidative stress, ageing and damaging inflammation PDF) How to Increase Cellular Glutathione The precision medicine strategy to treat COPD pulmonary traits in clinical practice: The role of N acetylcysteine Respiratory Medicine