What does N-A-C do? N-A-C (N-Acetyl-L-Cysteine) is in a powerful antioxidant amino acid and a precursor to the critical antioxidant glutathione. Size: 60 Tablets, Serving Size: 600 mg * Glutathione exerts a variety of protective effects, including detoxification and intracellular defense against oxidative stress. * Substances known to reduce glutathione status are acetaminophen and alcohol. *The advanced bilayer technology combines 1/3 Quick Release and 2/3 Sustained Release formats to both immediately raise and to maintain blood levels over a longer period of time. * N-A-C releases in the small intestine over a 4 hour period, compared to the 1.5 hour biological half-life of N-A-C in the bloodstream. * Protected by U.S. Patent 6,623,754. Suggested Usage: Take 1 to 4 N-A-C tablets per day, preferably on an empty stomach with fruit juice, or as directed by your qualified health care consultant. Other Ingredients: Polyacrylate, calcium phosphate, cellulose, stearic acid (vegetable source), magnesium stearate (vegetable source), silicon dioxide, modified cellulose and beet root powder (for color). U.S. Pharmaceutical Grade N-A-C. No wheat, no gluten, no soybeans, no dairy, no egg, no fish/shellfish, no peanuts/tree nuts.