Natural Factors N-Acetyl-L-Cysteine - 600 mg - NAC is a free form amino acid and a vital part of the body’s antioxidant defence system. It is needed for the production of glutathione, a key antioxidant involved in many physiological processes, such as fighting oxidative stress, maintaining a healthy immune system, repairing tissues, cellular detoxification, and supporting overall health. NAC supplementation has been clinically shown to increase the body’s antioxidant capacity and help reduce the severity and frequency of influenza-like symptoms in adults over 65. This is an ideal nutritional supplement for adults who would like to improve their immune system health. Natural Factors NAC is an effective option for anyone with high levels of oxidative stress or depleted glutathione stores.