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, readily absorbed form of vitamin C. Vitamin C is a powerful antioxidant shown to support collagen synthesis and respiratory and metabolic function and reduces oxidative stress. Helps protect the tissues of the body and important in the production of connective tissues like tendons and ligaments. ester-c has up to 4X more metabolic activity than standard vitamin C (ascorbic acid). Studies indicate Ester-C is absorbed twice as fast as vitamin C, and levels in tissues and blood are evident for 24 hours. Non-acidic and gentler on the stomach. Extended shelf life.