Buffered vitamin c powder is contains four buffering minerals that, when mixed with water, is irritating to the stomach and intestinal lining. Vitamin C, or ascorbic acid, is a white, crystalline, water soluble substance found in citrus fruits. As an antioxidant, Vitamin C scavenges in the body and protects tissues from oxidative stress. Vitamin C also promotes the absorption of iron, while inhibiIngredients: Supplement Facts Servings Per Container about 84Serving Size: 1 rounded teaspoon (approximately 5.4 g) Amount Per Serving Vitamin C (as ascorbic acid) 4000 mg Calcium (as calcium carbonate) 145 mg Magnesium (as magnesium carbonate) 55 mg Zinc (as zinc gluconate) 2 mg Potassium (as potassium carbonate) 365 mg