Reptilite? – 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! 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, Reptilite? is made of aragonite, the most soluble form of calcium carbonate available. Trusted by professional reptile breeders and hobbyists alike.