Vitamin and mineral fortified. 100% Complete Nutrition. Hartz Nutrition Universal Diet for Hamster, Gerbils, Mice & Pet Rats is a basic nutritional diet for many small pets. It contains may seeds and grains that are necessary for the development of muscles and bones and is enriched with vitamins and minerals for additional benefits. Hartz Wellness Principles are your guide to the best care for a healthy pet. When used in combination, these fundamentals are the cornerstone of a long, happy life. T - Health & Nutrition - A complete daily diet augmented with treats for variety and supplements for specific care needs; Fun & Recreation - Use toys and interactive treat to keep your pet fit and active, and to stimulate its mind. Out of cage playtime is also important and will strengthen your bond; Environmental Enrichment - While in its home, your pet needs essential care items. In addition to food, it needs clean water and a place to nest and sleep. It should also have access to toys and other dietary supplements. 100% Satisfaction guaranteed. Manufactured in the USA.