I've been using it, but not for belly issues. I had read that it dramatically improved some peoples energy level and my was lousy. It's worked really well for me. I take it twice a day (early morning and after lunch). I've also read that OOO can do the same though...so sometime in the next week I'm going to pick some up, stop the relacore and see if it works as well (I want to try it just because it is significantly cheaper.) If the OOO works as well for me with regards to energy, then I'll switch. If not, I intend to stay on relacore. It's nice to not feel like I'm dragging all day without feeling tweaked out like I've had too much caffeine.