Natural Factors Vitamin C 1000 mg Time Release with citrus bioflavonoids, rutin, and rosehips is designed to gradually release nutrients over an eight-hour period. Bioflavonoids enhance the absorption of vitamin C and act in synergy with vitamin C to provide antioxidant protection, keep collagen healthy, and help increase capillary strength. Vitamin C is a powerful antioxidant which helps to support healthy bones, cartilage, teeth, and gums. It helps protect cells against environmental pollutants and deficiencies in the daily diet.