Reacta-C is a clinically researched & patented 24-hour support formula that delivers Vitamin C to the body all day & night for greater immune support! This fully reacted complex of Strontium Calcium Ascorbate with L-Threonate is a non-acidic formula designed to be fast-acting, long-lasting and gentle on the stomach. Key ingredients, such as Bioflavonoids, Indole-3-Carbinol, and a highly synergistic Vitamin C support base, are included for maximum bioavailability and effectiveness.