NAC Detox Regulators from Doctor's Best® is a combination formula of NAC (N-acetyl cysteine), selenium and molybdenum. This specialized blend promotes production of glutathione—the master antioxidant—in the brain, liver and other organs. NAC boosts glutathione production while selenium and molybdenum assist proper glutathione function in the body. Optimal glutathione levels support energy production, detoxification and more.