Ester-C is a unique, patented form of calcium ascorbate that is less acidic and easier on the stomach than regular vitamin CEster-C® is the only form of vitamin C that has been clinically proven to last up to 24 hours in the white blood cells of the immune systemEnhanced with nourishing, energy-supporting B vitamins and electrolytesAdded calcium, magnesium, and trace minerals to support bone, joint, collagen, and skin healthNaturally sweetened , low-calorie powder blendMixes into a non-effervescent vitamin drink in a variety of great-tasting flavoursFormulated with naturally-occurring amino and fruit acids to enhance the natural flavour