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Maintain Healthy Respiratory Function Year-Round Immune Support A Dietary Supplement General Health Family Owned Since 1968 GMP Quality AssuredNOW® 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. ImmunEnhancer™, Elderberry, Echinacea, and Astragalus botanical extr...