Life Extension - Replaced with Augmented NAC N-acetyl-L-cysteine is an easily-absorbed nutrient with potent benefits for whole body health.1 N-acetyl-L-cysteine also helps maintain your body's supply of glutathione. N-acetyl-L-cysteine and glutathione have powerful antioxidant effects.2-5 Easy-to-absorb NAC formula Each capsule of our N-Acetyl-L-Cysteine contains 600 mg of this potent, rapidly absorbed nutrient.