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Antioxidant SupportDietary SupplementPotent Antioxidant that Supports Liver Health and Detoxification PathwaysSupports Detoxification of Environmental Toxins and PollutantsScience-Backed Quality Since 1969When 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 of NAC per capsule. NAC helps replenish glutathione a critical component of the body's defense system. It supports liver health and much more.