NAC can relieve symptoms of respiratory conditions by acting as an antioxidant and expectorant, loosening mucus in your air passageways. As an antioxidant, NAC helps replenish glutathione levels in your lungs and reduces inflammation in your bronchial tubes and lung tissue. Our NAC capsules are 100% pure. pullulan capsules shells are used making these amazing capsules vegan & vegetarian friendly. Each capsule contains 700mg of goodness.