Product Description:GNC Vitamin C 1000 combines 1000 mg Vitamin C with 100 mg Citrus Bioflavonoids Complex in a base of rose hips, a natural source of bioflavonoids. The Citrus Bioflavonoids Complex present ncludes Quercetin, Hesperidin and Rutin. Vitamin C with Citrus Bioflavonoids may have better absorption and retention in the body. It is also an antioxidant that helps to protect the body against free radical damage. Essential for healthy bones, teeth, blood vessels, and collagen and is necessary for the absorption of iron.