Purina One +Plus Indoor Advantage Salmon, Offer your indoor cat the purposeful nutrition she needs to thrive with Purina ONE +Plus Indoor Advantage With Real Salmon No. 1 Ingredient Natural With Added Vitamins, Minerals and Nutrients dry cat food. This tailored formula features real salmon as the number one ingredient delivered in fiber-rich, crunchy bites to support the needs of indoor cats. The high-quality protein in this weight control cat food helps your cat support a healthy weight and strong muscles, including a healthy heart. We include added vitamins for cats in our natural Purina indoor cat food formula, along with minerals and other nutrients to help provide 100 percent complete and balanced nutrition for adult cats.