The mechanism of action of N acetylcysteine (NAC): The emerging role of H2S and sulfane sulfur species ScienceDirect As I mention in my book, N acetyl cysteine (NAC) is not found in food sources, but in the body, it converts into cysteine. NAC acts as a precursor to glutathione, a powerful N Acetyl L Cysteine, NAC Easily absorbed Life Extension Europe L Glutathione NAC Collagen Detoxification Whitening Antioxidant 120 Capsules DID YOU KNOW NAC is a precursor to glutathione, the master antioxidant? This means it boosts your body's natural detox abilities, combats oxidative stress, and promotes overall immune health. Support your body