N-Acetyl Cysteine (NAC) is an amino acid that is a precursor to glutathione, thebody’s most powerful antioxidant. NAC is heavily researched in bronchial andlung disorders. It is also used for rapid recovery after workouts. NAC can beused in any cases where there is a need to rebuild the liver and promotesoptimal detoxification. It is also researched for protection from heavy metaldamage.