CAS Options provides a nutritionally concentrated synergistic blend of Reishi, Maitake and Shiitake mushrooms, which are well researched and have been shown in numerous studies to be potent immune enhancers. The proteoglycans and polysaccharides from mushrooms have been shown to nutritionally assist the immune system, reduce inflammation and can stimulate natural killer (NK) and T-helper cell activity. Additionally, this formula includes strong antioxidants found in Coenzyme Q-10, Green Tea and Selenium.