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They Key to the Power of Vitamin C Ester-C® is a revolutionary form of vitamin C ascorbate. Patented Ester-C ascorbate is a Body-Ready™ vitamin C complex containing essential C metabolities, including threonate. Unlike ordinary vitamin C, Ester-C is produced through an exclusive water-based manufacturing process, providing a nonacidic form of vitaim C that is gentle on your stomach. Source Naturals Ester-C also has added bioflavonoids which play a role in maintaining good health.