Rep-Cal Original (Coarse Grind) With D3 Is 100% Natural And An Excellent Source Of Calcium For All Reptiles And Amphibians; Especially Geckos That Will Consume The Powder From A Dish To Meet Their Calcium Needs. Scientifically Formulated, Readily Absorbed And Phosphorus-Free (To Prevent Metabolic Bone Desease) This Product Is Recommended By Veterinarians And Zoos Around The World!