Quercetin-Bromelain Complex is a unique formulation of quercetin, buffered vitamin C, and bromelain. Quercetin is a bioflavonoid that has antioxidant activity to support vascular and immune cell function. Magnesium ascorbate is a buffered form of vitamin C, a key antioxidant, which synergistically supports the quercetin activity. Bromelain is a proteolytic enzyme purified from pineapple.