Vitamin C with Bioflavonoids combines two powerful synergistic nutrients to enhance immune function and antioxidant activity. Vitamin C helps the body's immune system by supporting antibody responses and white blood cell function and activity while helping to maintain normal immune messenger molecules. Derived from the pith or white part of the citrus rind, Bioflavonoids help support vein health, normal capillary permeability and histamine levels, and maybe particularly useful for those interested in maintaining normal respiratory and sinus function.