After 40 years of dealing with constant sinus pressure, headaches and infections and enduring all the side effects of prescription and over the counter cures, I finally tried Colloidal Silver. I have not had a sinus headache since!! The pressure and pain are gone and I feel so much better and can think much more clearly too without all that other stuff going on in my head. It's great that there are no side effects like drowsiness or irritability.