New Roots Herbal N-Acetyl Cysteine - 600 mg - NAC is an acetylated form of the amino acid cysteine which is more efficiently absorbed. It is also an antioxidant that is helpful at fighting viruses. It is commonly used to help break down mucus and to protect from acetaminophen toxicity. In addition, it helps the body to synthesize the antioxidant glutathione. N-Acetyl Cysteine decongests the lungs, chelates heavy metals and chemicals, supports the immune system, and increases glutathione levels.