Not in most forms in my opinion. My concern is with d3 content and that most animals required dosage is unknown. I use reptocal since its d3 levels are less than that of other calcium supplements. I use it liberally with all my lizards(leopard geckos/day geckos/basilisks) on every insect and my geckos still eat it plain out of a dish. give a shallow dish of just calcium to your lizard as an option