SOURCE NATURALS - C-B-R - 500 TabletsDESCRIPTION C B R is a complex of vitamin C (ascorbic acid), citrus bioflavonoids, and rutin, a non citrus bioflavonoid. Vitamin C and bioflavonoids occur naturally together in plants, where they provide a synergistic antioxidant effect. Vitamin C is the single most commonly used vitamin supplement. It plays a major role in the formation of collagen, (a structural protein in connective tissue), in amino acid metabolism and hormone synthesis, and in