Unapiccolina (Irvine, Ca) on 01/14/2012:

I have had horrible allergies for 20 years and have taken just about everything. At the health food store I came across Quercetin & Bromelain. The Quercetin helps with histamine production. The Bromelain (comes from pineapple) helps with sinus swelling. If you are allergic to pineapple you shouldn't take this. Also Vitamin C helps the immune system.
I just wish someone had shared this with me 20 years ago. It took about a week to work for me, but I now wake up every morning without headaches, grogginess, stuffy nose, or puffy eyes. This is what I have been taking and it has been life changing!
Quercetin - 500 mg or more
Bromelain - 250 mg or more
Vitamin C - 1,000 mg
In researching Quercetin, I also found that it's naturally occuring in foods like black/green tea, red onion, apples, red grapes, tomato, cranberries, spinach, broccoli, carrots, strawberries, blueberries and pears. I have also been eating more of these items as well.
Hope this helps,
UnaPiccolina