You may have heard of the supporting benefits of quercetin. Now Source Naturals brings you Activated Quercetin(TM) a bioflavonoid complex. It is a unique bioflavonoid derived from plant sources. Bromelain is a pineapple enzyme that may assist the body in times of stress while magnesium ascorbate is a buffered (non-acidic) form of vitamin C that helps support the immune system.