Mr Johnson'S Supreme Rat And Mouse Food Is A Fibrous, Nutritious And Wholesome Blend Of Cereals, Grains, Vegetables, Seeds, Mealworms And Extrusions - Supplying Rats And Mice With A Tasty, Healthy Food In A Variety Of Textures To Help With Dental Wear. Recipe Contains Added Verm-XÂ ® For Intestinal Health. Mr Johnson’S Supreme Rat & Mouse Mix Is A Complementary Feed For Rats And Mice And Should Be Fed Together With A Small Quantity Of Suitable Fresh Fruit & Vegetables Daily And Fresh Clean Water Must Always Be Available.