Supports cellular health and immune system functionPromotes the formation of antioxidant glutathione Free-radical fighterGet multifaceted wellness support with NAC from NOW Foods. NAC (N-acetyl cysteine) is an amino acid that promotes the formation of glutathione, often called the master antioxidant. Glutathione is a potent free-radical fighter that also promotes optimal immune system function. NAC also supports healthy brain tissue. Each single-tablet serving delivers 1,000 mg NAC.These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.