I have used a lot of different makes of Quercetin, and I must say that Solgar's quality is just on a better level, especially with the Esther-C and the Bromelain. This product is a very good immune booster, I get rarely sick when using this and when I do get sick, my symptoms are not as severe.
I also give one capsule daily to my children ages 6, 7 and 9. It assist them especially during school.