Top 9 Benefits of NAC (N Acetyl Cysteine) NAC vs Glutathione: Differences, Similarities And Health Benefits NAC is one of those supplements that I always have on hand. It's impressive how broadly supportive NAC is. One time I was taking NAC 500 mg every day for about two NAC (N acetyl cysteine) is a supplement that supports detoxification, brain health, and lung functionand it's the precursor to the antioxidant glutathione! Key benefits of NAC: Detox Support Helps the liver break Amazon.com: DEAL SUPPLEMENT NAC Supplement (N Acetyl Cysteine) 1,000mg Per Serving with Reduced Glutathione, 240 Capsules Antioxidant Support for Immune Health, Lung, & Liver Function : Health & Household