From the Manufacturer N-Acetyl-L-Cysteine: What is it? N-acetyl-L-cysteine supports immune function, bronchial, respiratory health, and liver health. It is the body's precursor to glutathione, a potent antioxidant that shields cells from harm caused by free radicals. N-acetyl-L-cysteine helps protect your liver, immune system, and self from oxidative stress. Advantages of N-Acetyl-L-Cysteine 1. Promotes respiratory, bronchial, and immunological health 2. Promotes liver function and health 3. Strong antioxidant defense against oxidative damage 4. Gluten free | Non-GMO N-Acetyl-L-Cysteine 600mg 60ct