Advanced Nutrition Original Immune System Support Formula Powerful & Synergistic Immune System Support Immune Support Dietary Supplement Feel Better, Everyday Kosher Parve Dairy Free Soy Free GMP Certified Facility Powerful & Synergistic Immune System Support A synergistic formula of Vitamin C, Pantothenic Acid, Olive leaf extract, and other natural extract, Zahler Immune Defense provides powerful nutritional support for a healthy immune system and general wellness. Immune Defense should preferably be taken daily during times of seasonal change.