I used to dust his roaches and other invertebrates, but I've been informed that is he eats a significant amount of live mammal prey that the innards provide the necessary vitamins and the bones provide the necessary calcium. I like to just have a bin in his cage with some roaches that he can eat from at his leisure. The dusting tends to come off as a result. Should I be insuring that his invertebrates are fully dusted when he eats them. They are still gut loaded with good food.