DESC: Bio-active Bioflavonoid With Corn-free Vitamin C Hypoallergenic Citrus Free Quercetin + C contains crystalline pure nutrients. The nutrients are the purest and highest quality obtainable. Quercetin + C caps are easier to swallow and assimilate. Well tolerated by the most highly allergic individuals. Quercetin + c is a revolutionary, new, high potency, synergistic combination of quercetin, a non-citrus bioactive bioflavonoid derived from blue-green algae, and corn free vitamin C which is derived from sago palm. Quercetin is unique in that it is more potent than common bioflavonoid complexes and contains no citrus allergens.