ESTER C 1000 TABS - (with Citrus Bioflavonoid Complex) A unique ascorbate complex bound to calcium from calcium carbonate. This product also contains a citrus bioflavonoid complex. One tablet supplies: Vitamin C (from Ester C Calcium ascorbate)....1000 mg., Calcium (from Ester C calcium ascorbate)....100 mg., Citrus Bioflavonoid Complex....200 mg., Ester C is a licensed trademark of Inter-Cal Corporation.