PURINA ONE INDOOR ADVANTAGE with IMMUNE DEFENCE PLUS+ has been specially formulated with beta glucans, vitamin C & E and omega 3 & 6 fatty acids. Working in parallel this blend helps support first line immune defence for your cat: Vitamin E & C are natural antioxidants that help prevent cell damageassociated with aging and poor health Omega 3 & 6 fatty acids helps keep skin healthy to maintain a strong barrierto the external environment Beta glucans to help support optimal immune response.PURINA ONE Adult Indoor Advantage Dry Cat Food with Chicken contains prebiotic fibre to help reduce faecal aroma by promotingbalanced gut flora. Reduced calorie diet helps promote a healthy weight for your cat.