NOW&ampreg; Air Defense&ampreg; is a blend of ingredients that support healthy immune function and respiratory health during seasonal changes and year-round. Air Defense&ampreg; contains PARACTIN&ampreg;, a patented extract of Andrographis paniculata. Studies have shown that PARACTIN&ampreg; helps to support a healthy and balanced immune response. ImmunEnhancer&amptrade;, Elderberry, Echinacea, and Astragalus herbal extracts have also been included for their healthy immune supporting properties. Olive Leaf Extract has been added to help to maintain healthy respiratory function.*