PURINA ONE Sensitive 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 Sensitive Systems Dry Cat Food with Salmon & Tuna is specially formulated for cats with sensitive skin and stomach. Contains real salmon & tuna and prebiotic fibre to promote easy digestion and omega 3 & vitamin E to nourish sensitive skin.