Non-GMO100% VeganDietary Supplement500 mg Vitamin C200 mg Black ElderberryPatented 24 Hour SupportLab VerifiedDiscussion: 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 complex of Strontium Ascorbate and Calcium Ascorbate with L-Threonate is a non-acidic formula designed to be fast-acting, long-lasting and gentle on the stomach. Indole-3-Carbinol and a highly synergistic Vitamin C support base are included for maximum bioavailability and effectiveness. This unique formula also includes the highly complementary Black Elderberry extract for even greater immune benefit.