Plus Citrus Bioflavonoids Dietary Supplement Vegan Kosher Parve Gluten FreeBluebonnet's Buffered Vitamin C-500 mg Capsules provide pure vitamin C from calcium ascorbate, plus citrus bioflavonoids from fresh oranges, lemons, tangerines, grapefruit and limes plus, hesperidin and rutin. Available in easy-to-swallow vegetable capsules for maximum assimilation and absorption.