Once your cat reaches a mature age, you want to do all you can to maintain the vigor and vitality that makes cats so special. The high quality ingredients in Precise Naturals Feline Senior Formula do just that. Senior Formula is supplemented with L-Carnitine to help maintain a healthy weight and extra fiber to help reduce hairballs. And this nutritious Precise formula is preserved naturally using mixed tocopherols. Precise Naturals does not add any synthetic preservatives.