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 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 The mechanism of action of N acetylcysteine (NAC): The emerging role of H2S and sulfane sulfur species ScienceDirect Can N acetylcysteine (NAC) Supplements Increase Cellular Glutathione Glyteine Nature's Fusions Free Radical Protection NAC N Acetyl Cysteine 600mg 60 Capsules GNC Frontiers The role of N acetylcysteine in osteogenic microenvironment for bone tissue engineering