N-acetyl Cysteine (or NAC) is a more stable form of the amino acid L-Cysteine. As a precursor to L-Cysteine, NAC helps the body synthesize Glutathione. NAC possesses powerful antioxidant properties that may help fight cell-damaging free radicals. Studies have shown that oxidative stress caused by free radicals may contribute to premature aging of cells. NAC supports healthy liver function and lung function. NAC supports bronchial and respiratory health — IT ALSO ENCOURAGES HEALTHY IMMUNE CELLS!