NAC contains both sulfur and the amino acid cysteine, serving as a precursor to glutathione -- a vital antioxidant that provides protection against free radicals and toxins in the body. As well as providing antioxidant support, it has also been used to treat bronchitis, asthma, ear infections, help relieve hangover symptoms, help with symptoms associated with Lou Gehrig's and heart disease, lower cholesterol, reduce cancer treatment side effects, help with PCOS, and increase immunities against the flu. These products have a strict internet policy -- please contact us for more information on prices and delivery.