Dietary Supplement Easy to Swallow Capsules Support for the Body's Use of Vitamin C Purity & Potency Guaranteed Natural Factors Quercetin capsules are enhanced with Citrus Bioflavonoids, Bromelain and Rutin. Quercetin, a popular bioflavonoid, is essential to optimize the body's use of Vitamin C. Bioflavonoids are brightly-colored substances that are found in fruits and vegetables, typically as companions to Vitamin C. Bioflavonoids are essential for proper absorption of Vitamin C and have been shown to have antioxidant properties, increase capillary strength and keep collagen healthy.