Well, there are a few "wise men" on here that have been using it for, I think, 30+ years. I decided to trust them and put all 4 of my corns on it. They have not had any problems yet. And they look like they like it more than newspaper. I buy big bags of pine for $6 while the same amount of aspen is $15. I think I've been using it for 3 months now. I don't remember exactly. I have hatchlings, sub-adult, and adult on it and they are all fine.