I don't get sinus infections but I've read enough here do. And the reason I don't MAYBE is that I've been taking GrapeSEED Extract for such a long time. It contains anti viral, anti bacterial and anti fungal properties. So could be it's working for me. This is from the Grape.
Now GrapeFRUIT Seed extract is an anti viral and recommended for sinus infections. This from the GrapeFruit.
https://www.earthclinic.com/sinus-in...d-extract.html
In my book sure beats abx drugs.