High-quality protein from tuna: The main ingredient is classic tuna (usually 50% to 55% or more), an excellent source of high-quality protein. Protein is essential for supporting muscle mass, providing energy, and maintaining your cat's overall health. Complete and balanced formula: Unlike complementary foods, Kit Cat Complete is designed to be a complete and balanced meal. This means it provides all the vitamins, minerals, essential amino acids (such as taurine), and other essential nutrients your cat needs for a healthy life.