Corpet (Coriolus versicolor) is a natural product that acts as an immunonutrient, i.e. a specific nutrient that stimulates the immune system by promoting the production of cells with immune functions. Corpet is composed of the biomass of the mushroom Coriolus Versicolor and, as such, contains both the mycelium and the primodia (young fruiting body). Coriolus versicolor is atoxic and does not have any secondary side effects. The therapeutic properties of mushroom nutrition in general are attributed to the presence of polysaccharides, antioxidants and enzymes. In animal health, the role of mushroom enzymes in Corpet is to prevent oxidative "stress” as well as increase the immune system; thereby inhibiting the uncontrolled cell growth.