Airborne Vitamin C 1000 mg Effervescent Tablets with Elderberry. Each serving provides essential immune support with a crafted blend of Vitamin C, Vitamins A, E, Zinc, and Selenium. These tablets are sugar-free and gluten-free, made with natural color sources. The formula includes an original herbal blend with Echinacea and Ginger, and contains European Black Elderberry. High in antioxidants, these effervescent tablets help support your immune system. One effervescent tablet is equivalent to high levels of antioxidants and an excellent source of Zinc and Selenium.