Dietary Supplement. Non-acidic. Gentler, unique form of Vitamin C. With Bioflavonoids. 100% Vegetarian. Natrol Ester-C is a unique form of Vitamin C containing naturally occurring metabolites. Ester-C's patented manufacturing process neutralizes the pH, making Ester-C gentle on the digestive system. No yeast, wheat, corn, milk, egg, soy, glutens, artificial colors or flavors, added sugar, starch or preservatives.