I have had chronic sinusitis for years now - years!! I thought it would never go away and was completely miserable until I read on the internet how Niacinimide (B3) can kill candida. I suspected all along that my sinus problems were yeast related. I started taking the Niacinimide about 5 days ago and right now I'd say I'm about 98% clear already!! I estimate that in another couple of days I should be cured of this nightmare! I started out taking 100mg 3X a day and now I'm up to 300mg 3X a day. I'll probably go up a little more and then get a maintenance dose. I would think Niacinimide would help all types of sinus issues. A MUST TRY!!! Good luck out there! Remember, it's Niacinimide, not Niacin!