Ester-C® is a breakthrough patented Vitamin C formula supported with naturally occurring metabolites. Metabolites help enhance the absorption of Vitamin C by your white blood cells, an important part of your immune system. Ester-C®'s unique, chemical-free manufacturing process neutralizes pH, making it non-acidic and gentle on the stomach. In a daily dose, Ester-C® delivers the advanced active immune system support and the activity of potent antioxidants you can depend on. Added Citrus Bioflavonoids may help your body better absorb and utilize Vitamin C.** • Delivers 500mg Vitamin C with Citrus Bioflavonoids • Unique patented form of Vitamin C • Non-acidic and gentle on stomach • Immune and antioxidant support** Vegetarian Contains 90 Tablets.