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New Roots: N-AcetylCysteine NAC 600 MG. Now with 600 mg of N‑acetylcysteine N‑Acetylcysteine has emerged among the leading nonprescription nutrients for inflammation-related respiratory-system conditions. Known as NAC, N‑acetylcysteine is a precursor of the amino acid ʟ‑cysteine, a compound instrumental for the production of glutathione, the body’s master antioxidant. NAC’s main therapeutic application is for the relief of symptoms of chronic bronchitis and relief of respiratory tract inflammation. It acts as a mucolytic, breaking down and thinning mucus within the respiratory tract. Its antioxidant properties also make it a treatment option for illnesses resulting from free oxygen radicals.