Ester C is an advanced form of Vitamin C. Ester C is formulated with calcium and bioflavonoids to allow better absorption. Ester C provides support for the body at the circulatory and tissue level. Ester C supplies much of the same aid to the biological function of the body as Vitamin C. Ester C provides support to the immune system as well as the connective tissue, collagen. Ester C also plays a large role as an effective antioxidant to protect the body from harmful free radicals. Ester C can be found in various formulas at WebVitamins to fit individual needs.