From spring to summer I suffer from sinus infections. 3-4 years ago I started taking acedolpholis, a nutritional supplement, for my sinuses. It has saved me from emergency room visits & having to get antibiotics from the doctor! It is the active culture from yogurt, and there is no known allergies. I take it a week or so before it starts getting warm out in April, and continue until November. If I miss a week, I can really tell!