Dietary Supplement. Antioxidant and Glutathione precursor. Vegan. Gluten free. No wheat, gluten, soybeans, dairy, egg, fish/shellfish, peanuts/tree nuts. Bilayer tablets. Quick + sustained release. Supports liver function. NAC sustain is a quick release/sustained release formulation of N-actyl-L-Cysteine (NAC), an antioxidant amino acid and a precursor to the antioxidant glutathione. Glutathione is important for dextoxification. NAC sustain is formulated with advanced bilayer sustain tablets that combine 1/3 Quick Release with 2/3 Sustained Release formats to release NAC over time. www.jarrow.com. (These statement has not been evaluated by the Food and Drug administration. This product is not intended to diagnose, treat, cure or prevent any disease.)