Ester C Plus is exclusively formulated by Solgar and provides a patented, Vitamin C that is gentle on the stomach. The Vitamin C metabolites in Ester C positively impact the retention of Vitamin C in cells, providing. A special manufacturing process is employed to form a unique calcium ascorbate metabolite complex. This well-retained complex yields beneficial antioxidant and immune system supportIngredients: Supplement Facts Serving Size: 1 Tablet Amount Per Serving % Daily Value Calories 5 Total Carbohydrate 1 g 1% Vitamin C (as Ester-C calcium ascorbate) 1000 mg 1,667% Calcium (as Ester-C calcium ascorbate) 100 mg 10% Citrus Bioflavonoids Complex 200 mg * Acerola Extract 25 mg * Rose Hips (fruit) 25 mg * Rutin 25 mg * *Daily Value not Established. Other Ingredients: Vegetable Cellulose, Microcrystalline Cellulose, Silica, Vegetable Stearic Acid, Dicalcium Phosphate, Vegetable Magnesium Stearate, Vegetable Glycerin.