For me, it's not whether or not it's been proven, but the fact that it HASN'T been proven if it's safe or not. I am head over heels for my little guy, and if anything happened to him, I'd never forgive myself if there was even the tiniest possibility that it could have been my fault. I fully intend to have him with me when we're both senior citizens. So, until I know it's not going to hurt him, I'm going to use something that I know won't hurt him by itself. Just because something happens in the wild, doesn't mean we should make it happen in captivity.