rep-cal phosphorous-free calcium ultrafine powder reptile/amphibian supplement with vitamin d3, 3-pack of 3.3 ounce container rep-cal rep-cal reptile calcium powder with d3rep-cal is an excellent source of calcium for all reptiles and amphibians. scientifically formulated from 100% natural oyster shell phosphorous-free calcium carbonate with added vitamin d3 to aid in the absorption of calcium. ultrafine ground powder.