This product is great if you need a remedy for you sinus congestion, but don't want to take medication. It will not dry out your sinuses, but will get things flowing in right direction. As far as I know it has no nasty side effects (at least I have not experienced any).
I took the high recommended dose until I ran out . I could tell no difference in my allergy symptoms. It didn't make me sick, so I guess it was of good quality.