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. Suggested Use: Up to 25lbs...1/2 tablet twice daily, 25 to 50lbs...1 tablet twice daily, 50 to 100lbs...2 tablets twice daily, Over 100lbs...3 tablets twice daily Given orally between meals or crumbled and mixed with moist food. When a dog's immune system is being severely challenged, additional support can be given by doubling the suggested amount for 3-6 months. Responses to natural dietary supplements may vary by animal. One tablet guaranteed to contain: Vitamin A...1050 I.U., Vitamin E (d-alpha tocopherol)...53 I.U., Selenium...26mcg, Reishi Mushroom...578mg, Shiitake Mushroom...446mg, Green Tea Powder...105mg, Maitake Mushroom...95mg, Vitamin C...105mg, N-acetylcysteine...79mg, Coenzyme Q-10...1mg Ingredients: A proprietary blend of Reishi Mushroom, Bone Meal, Shiitake Mushroom, Green Tea Powder, Microcrystalline Cellulose, Calcium Ascorbate, Glyceryl Monostearate, Maitake Mushroom, N-acetylcysteine, d-alpha tocopherol, Croscarmellose Sodium, Magnesium Stearate, Silica Dioxide, Ascorbyl Palmitate, Selenium, Vitamin A, and Coenzyme Q-10