Supports the immune system Promotes vein and capillary health Helps support stable mast cells 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. As a potent antioxidant, Vitamin C scavenges reactive oxygen species, protecting cells and tissues from oxidative damage. This formula also contains a 55-60% Citrus Bioflavonoid Complex. Derived from the pith or white part of the citrus rind, Bioflavonoids help support vein health, normal capillary permeability and histamine levels, and may be particularly useful for those interested in maintaining normal respiratory and sinus function.