Rep-Cal Ultrafine (Fine Grind) With D3 Is An Excellent Source Of Calcium For All Reptiles And Amphibians. Scientifically Formulated And 100% Natural, Rep-Cal Calcium With D3 Is Readily Absorbed And Sticks To Any Insect Or Food Item. It'S Phosphorus-Free (To Prevent Metabolic Bone Desease) And Recommended By Veterinarians And Zoos Around The World For Over 20 Years!