Airborne® Dual Action™ Immune Support Supplement Effervescent Tablet Citrus. 500 mg of Beta-Immune Booster™. High in antioxidants (vitamins A, C & E). 500 mg of Vitamin C. Excellent source of zinc & selenium. What is a Beta-Immune Booster™ anyway Supports key immune activity to help your immune cells to work at their best*. Recyclable carton.T Questions Call 1-800-590-9794 or visit airbornehealth.com. ©2014 RB. Reckitt Benckiser.