Not like you haven't heard enough reviews about AMP, but I took the lowest recommended dose (2 caps) an hour ago, and I am so thankful that I didn't take 4 caps like many suggest. If you try this supplement out, start with 2 caps. I don't know if it is just caffeine overload, but I feel like I'm on meth--considerably more stimulation than I care to have right now. I guess I'll have to wait for the caffeine to wear off to better evaluate it.