T-Rex Iguana Dry Formula Adult with added vitamins and minerals is a complete and balanced diet for your Iguana. The formula was formulated by a professional nutritionist to provide the best nutrition for your pet. It comes in a juvenile and adult formula in order to meet the nutritional needs of each stage of your Iguana’s life. Available in 6 oz, 12 oz, 24 oz, 10 lb bag and 40 lb bag.