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A customized formulation of Ester-C® with bioflavonoids. Ester-C® is a patented nutritional product that contains ascorbic acid and calcium. This formulation is non-acidic and minimally irritating to the intestines.* Esterol also provides 3 types of bioflavonoids - quercetin, rutin, and proanthocyanidins from grape seed extract. Ester-C® vitamin C is corn-source.