All Natural Vitamin-Fortified Calcium Carbonate Substrate . No artificial colors or color sealers. Excellent substrate for bearded dragons, uromastyx lizards, monitors, geckos (including leopard geckos), and desert tortoises. Increases calcium delivery in all desert species of reptiles. Fortified with vitamins and beta carotene for increased health benefits. Does not contain fat-soluble vitamins which can be toxic in large doses. Ultra fine grade to help prevent against impaction from over consumption.