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NAC is a precursor to glutathione in the body which is the main antioxidant in our system that prevents oxidative damage to cells. It is important to note that it is thought that if taking NAC orally it will help enhance glutathione production. When looking to boost glutathione levels we prefer to use intravenous (IV) forms. In cases where we recommend NAC we also tend to recommend avoiding mucous forming foods such as: cow and goat dairy products (milk, cheese, butter, yogurt), eggs, refined sugars and occasionally orange juice, bananas and peanuts. This helps to decrease the formation of mucous before it starts. Saline sprays and nasal irrigation can help as well to decrease congestion directly and food sensitivities may cause inflammation that can aggravate symptoms as well.