2:1 Calcium/ Phosphorus T-Rex 2:1 provides both minerals and vitamins in one easy to use product. No other product on the market provides this combination. T-Rex 2:1 is designed for use with HERBIVOROUS reptiles which eat a vegetable diet that may be lacking in phosphorus, as well as calcium. It is scientifically formulated to provide the proper 2:1 ratio of calcium to phosphorus required by these animals. T-REX 2:1 is highly palatable, easily absorbed and cost effective. Simply sprinkle over the reptile's food 3 to 4 times a week. T-Rex 2:1 is available in two sizes: 60g (2oz) and 240g (8oz). Scientifically formulated to provide the 2 to 1 ratio of Calcium to Phosphorous required by herbivorous reptiles.