The complexity of the human immune system knows no bounds; it is a finely-tuned group of cells, organs, tissues, and substances manufactured by the body that act upon them. The main function of the immune system is to protect us from foreign invaders, known as pathogens, such as viral or bacterial infections. How well the body resists illness, or how quickly a person recovers from illness, is a direct reflection of the state in which the immune system is functioning. When th