Sisu Energy Boost with Ester-C, Lemon-Lime, 24-hour Immune Support, Vitamin C Drink Mix with Energizing B Vitamins & Electrolytes, 30 Individual Packets, Vegan, Non-GMO, Gluten, Dairy Free

1,000 mg of Ester-C vitamin C per serving Ester-C is a unique, patented form of calcium ascorbate that is less acidic and easier on the stomach than regular vitamin C Ester-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 system