I used to use some local bee pollen for inhalant allergies.
After a bit over two years following the suggestions here at Ask moreless regarding diet, food selection, and the various auxiliary methods, just do not need it anymore.
BTW, MOM [milk of magnesia] works a treat on the sinusitis. I had a friend over yesterday who was really suffering, and got her to gargle with some for a minute or two. She cleared up within 20 minutes, and was still fine when she left, 4 hours later! [She has suffered extremely for many years, even had surgery recommended as a solution to her constant headaches, blocked sinuses, and sinus infections!!!]
She bought her own MOM on the way home, and is now eager to progress with other ideas from this forum!
Keep seeking, applying, sharing accurate knowledge in order to
Keep seeking abundant life and joy!