Didn't really know where else to post this question, but does anyone know of any suppliments that can cause or exacerbate sinus congestion. I am on antibiotics for a sinus infection and am feeling better during the day, but every evening my sinuses will suddenly swell shut. I take NAC, biotin and chlorella at night and am wondering if any of these could possibly be causing it. Hoping to find an answer so I can sleep at night. Thanks!