NOW Air Defense is a blend of vitamins, minerals, herbs and amino acids that support optimal immune function and respiratory health. Air Defense contains PARACTIN®, a patented extract of Andrographis paniculata. Studies have shown that PARACTIN helps to support a healthy and balanced immune response. ImmunEnhancer AG, Elderberry, Echinacea, and Astragalus herbal extracts have also been included for their immune supporting properties. Olive Leaf Extract has been added to help to maintain healthy respiratory function. The vitamins, minerals, and amino acids present in NOW Air Defense work together with our herbal blend to support healthy immune function during seasonal changes and year-round.