Calcium deficiency is a major dietary problem in captive reptiles and amphibians using a Calcium Powder helps combat this problem. Exo Terra Calcium Powder Supplement contains high levels of calcium to help ensure long-term health. Exo Terra Calcium Powder Supplement is a complementary food suitable for reptiles and amphibians and contains the essential elements for proper calcium metabolism. Exo Terra Calcium powder is a low phosphorus Ultra fine powder which is a must have supplement to keep your reptile healthy.