Ester-C tablets give you immune system support at the cellular level for up to 24 hours to maintain a healthy immune system* Ester-C is non-acidic, so it's stomach-friendly Ester-C is gentle on your stomach so you can comfortably take it every day Ester-C tablets give your immune system the support it needs, while also providing your body with antioxidant vitamin C to help fight free radicals* One tablet a day can give your body the immune support it needs 24/7* Ester-C also contains C-Sorb, a citrus bioflavonoids complex Ester-C, along with C-Sorb & naturally occurring metabolites, works synergistically to enhance the retention of Vitamin C in your body, supporting your immune system for 24 hours*