Many cells in the immune system proliferate very rapidly. Glutamine facilitates this process, functioning as a biosynthetic precursor and as an energy source [9,10]. Glutamine heals the defense system, probably by increasing antioxidant protection and also by increasing the effectiveness of the bowel-barrier function. Glutamine is very important in optimizing the immune system, by way of promoting lymphocyte proliferation and optimum functioning of neutrophils and macrophages