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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. Ester-C vitamin C is corn-source.