Potent antioxidant that supports liver health and detoxification pathways Supports detoxification of environmental toxins and pollutants Supports healthy respiratory function Supports cellular antioxidant activity When free radicals attack, fight back with NAC! As a powerful antioxidant amino acid, Swanson NAC (N-acetyl cysteine) is an important weapon in the war against free radicals and offers 600 mg / 400 mg of NAC per capsule. NAC helps replenish glutathione, a critical component of the body’s defense system. It supports liver health and much more.