N-A-CRelieves symptoms of chronic bronchitis Promotes respiratory health, helps eliminate excess mucus Protects the liver by stimulating glutathione levels Promotes detoxification N Acetyl L Cysteine or N A C is an acetylated form of the amino acid cysteine. Cysteine is the main precursor of glutathione (GSH), the most important antioxidant produced by the body. Glutathione helps chelate toxins and heavy metals in the body. N A C is approved as a