Maintain healthy respiratory function year-round immune support now air defense is a blend of ingredients that promote healthy, All-Season immune system and respiratory health. Air defense features paractin, a patented extract of Andrographis paniculata, which has been shown in scientific studies to support a healthy and balanced immune response. Immune enhancer, elderberry, Echinacea, and Astragalus botanical extracts have been included to support normal immune system function. Olive Leaf Extract has also been added to help maintain healthy respiratory function. The registered trademark air defense is being used Pursuant to a limited trademark license Agreement with NaturalCare products, Inc. Paractin is the registered trademark of HP ingredients ImmunEnhancer is a registered trademark of Lonza Inc. Natural color variation may occur in this product.