A powerful blend of vitamin C, 24 nutrients, 7 B vitamins, anitoxidants and electrolytes is what makes Emergen-C your go-to cold and flu season supplement. Emergen-C comes in a box of 30 packets. Rip one open, mix with water and down a glass of fizzy goodness, knowing that 1000 mg of vitamin C will go right to work fortifying your immune system.