C-500 mg Plus Bioflavonoids from Bluebonnet Caplets are made of non-GMO, identity-preserved (IP) vitamin C derived from L-ascorbic acid, hesperidin, and rutin, as well as a complex of citrus bioflavonoids derived from oranges, lemons, tangerines, grapefruits, and limes. accessible as simple-to-ingest caplets.