I'm diabetic and am looking for a sugar substitute. I'm going to try agave nectar, but I also wanted to try one in powder form. I've heard that stevia is great and has a low glycemic index, but I've also read that the long term side effects are unknown. Somewhere else, I've read that stevia has been banned in certain countries because they aren't sure its a safe product. Anyone know anything about this stuff? Has anyone used it for a prolonged period of time?