Clinically Studied Substantiated Dose Dietary Supplement Support: Immunity Cellular Health Antioxidant Levels Powerful Antioxidant Support Free radicals are byproducts of cell metabolism, and too many free radicals can lead to oxidative stress, which can be harmful to your health. Antioxidants fight oxidative stress. While your body can produce antioxidants naturally, they are ideally supplied by foods and supplements like N-acetyl-l-cysteine (NAC). NAC is a powerful antioxidant and an important amino acid that supports a variety of biological processes. By increasing glutathione levels, NAC helps strengthen your immune system and provides you with greater protection against free radicals and oxidative stress. Every one of these capsules contains 600mg of NAC - the clinically studied dose of this potent compound - designed for maximum impact and real results.