Fluker's Calcium:Phosphorus 2:1 is the perfect dust that provides the required calcium to phosphorus ratio your pet needs for strong, healthy bones and vital bodily functions. This dust is preferable for lizards and turtles who eat small amounts of crickets, mealworms, wax worms, mice, etc. depriving them of adequate phosphorus. For pets consuming large amounts of these high phosphorus foods, use Fluker's Calcium Supplement.