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Foodscience N-Acetyl Cysteine an amino acid supplement to support immune system function and lung health. N-Acetyl Cysteine (NAC) is a non-essential, free-form amino acid that is a highly stable form of cysteine. NAC has antioxidant properties and is necessary for the production of glutathione. NAC helps to support healthy lung tissue and the body’s natural defenses including cellular health.