I have been using bark, but I hate the stuff because if you try to keep it a little moist, bugs with start to grow. Thats fine because you're supposed to replace the substrate anyhow, but Reptibark and stuff like that are a little expensive. Paper towels are, in my opinion, a pain because everything has to be moved in order to change it. I like vermiculite because I can keep it somewhat damp and pack it with my hands. It also absorbs very well and nothing in it will rot (inorganic).
All I want to know is whether or not it is safe in case on accidental ingestion or something like that.