Purina Pro Plan LiveCLear Prime Plus Formula Chicken, Master caring for your senior cat while reducing the main allergen in cat hair and dander with Purina Pro Plan LIVECLEAR Adult 7+ Prime Plus Longer Life Formula dry cat food. Backed by over a decade of research, this Purina cat food simply and safely neutralizes Fel D1, a common allergen in cat saliva, with a key protein from eggs. It's shown to significantly reduce the major allergen in cat hair and dander by an average of 47 percent starting in the third week of daily feeding. The high protein cat food for senior cats features a proprietary blend proven to improve and extend the life of cats age 7.