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N-Acetyl-L-Cysteine (NAC) is a more stable form of the amino acid L-Cysteine and is the most effective way to boost Glutathione levels in the body. NAC has all the properties of L-Cysteine but is more water soluble and said to be more bio-available than L-Cysteine. NAC makes up Glutathione, a critical antioxidant scientifically proven to scavenge free radicals. NAC has the unique ability to maintain healthy lung tissue, support the body's natural defenses and enhance cellular health and longevity. These qualities make NAC especially beneficial for active people, the elderly, and those exposed to polluted environments. What makes NAC effective as a glutathione booster is the fact that it is a stable amino acid that can retain up to six times the amount of the sulfur and sulfhydryl groups after digestion. Scientists believe that sulfur and sulfur compounds may be central to glutathione. This product contains 600 mg of NAC per serving.