Airborne wants to keep its users from being grounded. The company makes a dietary supplement that contains herbal extracts, vitamins, electrolytes, amino acids, and antioxidants meant to boost the immune system. The effervescent tablets come in four flavors and a powdered formulation that dissolves and bubbles in water. The company sells its products nationwide in pharmacies, supermarkets, and mass merchant retailers such as Costco, CVS Health, Target, and Wal-Mart. Airborne was established in 1997 by former second-grade teacher Victoria Knight-McDowell. Supplement maker Schiff Nutrition International bought the company in 2012.