Rose Hips powder has been the answer to my chronic sinusitis. If you take the powder, make sure to get an organic brand and start slow - like 1/4 teaspoon. Build up to a higher dose you are comfortable. Keeps me up if I take too much, but that could just be me. I have an extremely sensitive system. Anyway, rose hips has totally cured the wretched sinusitis I've had for years already! I did get a little more stuffy the first few days - I guess it was a detox reaction. For me, I took pure Rose Hip powder alone - no added vitamin C or anything else. Rose hips powder is must try for sinus problems!! I can't emphasize that enough!