Quercetin is a naturally occurring flavonoid found in plant tissues such as apples, onions, tea and grapes. Its antioxidant properties protect the body from harmful free-radical damage.
Quercetin supports healthy histamine levels, which promote proper immune function. It’s often combined with bromelain, an enzyme from pineapple, for immune system support. Some studies suggest that quercetin improves pain and other symptoms in men with chronic prostatitis (inflammation of the prostate).*