Immune Health New Improved Formula OptiZinc AHCC Vitamins C & D Echinacea Astragalus Andrographis Dietary SupplementImmunoComplex contains the world"s most researched immune health ingredients in dosages supported by human clinical studies, including: AHCC from Japanese medicinal mushrooms shown to increase activity of NK cells and cytokines, backed by 26 PubMed-listed studies and used in over 100 clinics. A blend of three clinically researched immune-boosting herbal extracts standardized to hey bioactive components. Vitamins and minerals necessary for healthy immunity but frequently deficient in our diet, including highly absorbable forms of Vitamin C,D and Zinc (OptiZinc).