Ester C Ester C Vitamin C is an antioxidant and its activity is enhanced by a metabolite that is used to activate the vitamin C molecules making it easier for the body to transport them from cell to cell for numerous health benefits. Download PI Each Tablet Contains:Vitamin C = 250 mgSodium Ascorbate = 10 mgCalcium Ascorbate = 7 mgThreonic Acid = 2 mg InactivesSodium hydrogen carbonate, citric acid, inulin, orange flavour, beetroot powder, sodium saccharin & beta carotene 1%.