PURINA ONE Mature 7+ with IMMUNE DEFENCE PLUS+ has been speciallyformulated 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 responsePURINA ONE Mature 7+ provides the optimal nutrition to help support key vital functions and overall health of mature cats