One reviewer said that this supplement cured their sinus problems, including a headache and runny nose. While this isn't the primary purpose of a N-Acetylcysteine supplement, it can have this effect. Best NAC Detox Regulators has a vanilla flavor, which may be important to some, because unflavored and unscented NAC products can have a terrible smell. If you're taking it for antioxidant effects, you probably won't notice results for a long time. This can still be important for your long term health.