Having suffered from severe environmental and household allergens for all of my life, this is the single most effective treatment I have ever taken. It has been a life changer. Before beginning use of this product 2 years ago, my seasonal allergies would inevitably morph into a more serious respiratory infection, bronchitis, pneumonia, combinations thereof, etc., like clockwork each year. I tried every other prescription and OTC product over the many years and found them to be minimally helpful at best and not with it to load my body up on daily pharmaceuticals.At the advice of a friend, I tried this during my peak allergy season and found significant relief in about 2 weeks. While my symptoms did not abate entirely, they were manageable, let me actually enjoy the season and outdoor activities and feel like a human, not a zombie. Since then, I have not had a single non-functioning day due to allergy symptoms or a single round of respiratory illness at all. None.I was unable to get ahold of this for a a little while and had to try some alternatives. They helped, but left me with my familiar allergy related nuisances. When I returned to Toplux, I retuned to being all but symptom free and greatly relived to be 'back' again!