Bioflavonoids are water-soluble compounds present in citrus fruits, rosehips, and other plants. In humans, bioflavonoids maintain resistance of capillary walls to permeation and change of pressure, and have synergistic antioxidant effects with vitamin C, making them potent free radical scavengers.* This product from Twinlab offers the highest bioflavonoid content from fresh lemon, orange, grapefruit, lime and tangerine concentrates, along with the greatest number of individual bioflavonoids available from any manufacturer.