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 COPD in Focus: Current Challenges and New Horizons in Treatment with Biocytogen's Antibody Innovation The antioxidant N acetylcysteine promotes immune response and inhibits epithelial mesenchymal transition to alleviate pulmonary fibrosis in chronic obstructive pulmonary disease by suppressing the VWF p38 MAPK axis Molecular Medicine Springer Best Glutathione Supplement 4 Recommendations in 2026