I tried it for a few months and didn't feel much different one way or the other—maybe a slight "up" but that's it. I stopped using it. I did not find it to be

I tried it for a few months and didn't feel much different one way or the other—maybe a slight "up" but that's it. I stopped using it. I did not find it to be addictive, but reactions to substances like this are highly variable across the population. I'm curious if there have been any controlled studies on its usage and effects.