Natural Factors Balanced C Extra - An immune-support formula that combines the antioxidant benefits of vitamin C with a bioflavonoid complex for enhanced support. Vitamin C is not stored by the body and needs to be consumed daily in order to maintain the levels recommended for overall health. In addition, the body’s need for vitamin C increases during times of stress, such as intense physical activity, illness, antibiotic use, and exposure to pollutants. Bioflavonoids are found in many fruits, vegetables, and herbs. Bioflavonoids have been shown to improve the absorption and therapeutic action of vitamin C and protect vitamin C from oxidation in the body. Both vitamin C and bioflavonoids help protect tissues from free radical damage. Natural Factors Balanced C Extra contains 500 mg of vitamin C blended with citrus bioflavonoids, rutin, rosehips, and hesperidin.