I absolutely love NAC (N Acetyl Cysteine) for so many reasons! Not only is it fantastic for upper respiratory issues, but it also plays a crucial role in promoting glutathione, which is Immunocal: Clinically Proven Glutathione Boost I Immunotec Immunotec 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 Glutathione S transferases and their implications in the lung diseases asthma and chronic obstructive pulmonary disease: Early life susceptibility? ScienceDirect Nutrifactor Gluta Fair Maintains Skin Health and Immune System