I have been taking Quercetin which works well for me to alleviate severe allergy problems. However, recently I have been having elevated blood pressure and palpitations. I have a suspicion that Quercetin may be involved. My blood pressure got as high as 199/96 and the palpitations were almost constant at time. A trip to the ER and two EKG's showed no problems but I get very uncomfortable and feel very anxious when these events occur. The Quercetin I take has 250 mg per capsule and in addition l00 mg Vit C, 15 mg Magnesium carbonate, Bromelain 25 mg and Lemon bioflavonoid complex 50 mg. I have taken as many as 6 capsules per day.