Ester-C® (Calcium Ascorbate) is a unique, patented ascorbate complex bound with Calcium Carbonate. Naturally processed in purified water without the use of alcohol or acetone solvents. This makes Ester-C® a more readily available, readily absorbed form of Vitamin C. Ester-C®, a well-known anti-oxidant has been shown to aid in reducing joint cartilage degeneration and decrease susceptibility to infections. Ester-C® has up to 4X more metabolic activity than standard Vitamin-C (ascorbic Acid). Contains 7,000 mg Ester-C® per 1/2 measure.