The flu pack contains four products that are designed to optimize your immune system. The reason why we get sick is because our immune system is compromised, and when we come into contact with a virus, our body's can't fight it off. The most important thing to do in maintaining good health is to eat a well balanced diet, but in order to support your immune system's defense, the cold and flu pack gives you that extra protection, so that when you come into contact with the cold or flu virus, your body has the ammunition to fight it off more aggressively and quickly. It contains the GREEN WALNUT COMPLEX, this is designed to kill parasites that leach nutrients from your system and compromise immunity (everyone has parasites). COLLOIDAL SILVER PLUS is designed to kill bacteria and viruses. IMMUNO-TONIC is designed to boost immunity, it contains Echinacea, and lastly ACAI BERRY with anti-oxidants ,which neutralizes free radicals from suppressing the immune system; research indicates that free radicals are a precursor to many diseases..