Zoo Med Repti Calcium with D3 3ozZoo Med’s Repti Calcium with vitamin D3 is a phosphorus-free calcium supplement for reptiles and amphibians. We use only precipitated calcium carbonate which is white in color and is essentially lead free. Pure calcium carbonate is white, not gray. The calcium carbonate particles in Repti Calcium have a unique shape, and an extremely high surface area per gram, resulting in increased calcium bioavailability.Be sure to add me to your favorites list!Powered by eCRATER . List your items fast and easy and manage your active items.