Natural Factors C tablets contain 500 mg of vitamin C in a base of bioflavonoids, hesperidin, rosehips, and rutin to support the bodys use of vitamin C. Bioflavonoids and vitamin C work synergistically to enhance each others activity. Bioflavonoids are essential for proper absorption of vitamin C and have been shown to keep collagen healthy, have antioxidant properties and to increase capillary strength. Vitamin C is a potent, nutritional antioxidant supporting healthy bones, cartilage, teeth, and gums. It helps protect cells against environmental pollutants and deficiencies in the daily diet.