N-Acetyl-L-Cysteine (NAC) from Natural Factors is a free form amino acid required by the body to make glutathione. Glutathione is a key antioxidant that is involved in many physiological processes, such as fighting oxidative stress, repairing tissues, and supporting overall health. It also recycles other antioxidants and helps reduce the severity and frequency of flu-like symptoms in adults over 65.Medicinal IngredientsNon-Medicinal IngredientsVegetarian capsule (carbohydrate gum [cellulose], purified water), microcrystalline cellulose, croscarmellose sodium, vegetable grade magnesium stearate (lubricant).N-Acetyl-L-Cysteine (NAC) is a highly stable form of cysteine and is a precursor in the body to the critical antioxidant glutathione. It provides antioxidant support and helps to reduce the severity and frequency of influenza-like symptoms in adults over 65 years of age and in those suffering from chronic degenerative diseases.