N-Acetyl L-Cysteine (NAC) is a precursor of L-cysteine that promotes the biosynthesis of glutathione.* lt is a compound containing sulfhydryl groups and has been shown to support healthy lung function through its mucolytic capability.* NAC is a powerful antioxidant that acts directly as a scavenger of free radicals, especially oxygen radicals.* In addition, NAC can help to regulate cell metabolic activity, anti-apoptosis and prevent DNA damage.