An all natural calcium substrate; ideal for true Chameleons or any Tortoise, Snake, lizard, arachnid, or insect that comes from an arid or semi arid environment. The naturally spherical grains won't scratch your valuable animals inside or out! there are no artificial dyes or chemicals in Reptile this low impact substrate also contains strontium and magnesium while being free of silica and phosphates. Though not intended as a food source or supplement, it is 100% Edible and easily digestible. In fact, Reptile is made of aragonite, the most soluble form of calcium carbonate available. Reptile also contains naturally occurring strontium, which recent research indicates may increase bone density. Trusted by professional Reptile breeders and hobbyists alike.