As a physician, I have a built-in skepticism when it comes to trying sports supplements, and it takes a lot for a supplement to impress me. So when I say that SWAT Fuel makes two of the very best thermogenic fat burner/preworkout formulas, you can believe that they are pretty exceptional. I have used SWAT Fuel products for two years now,and never once have I had issues with jitters, cutaneous flush or a sudden slump in energy. What I get is a very pleasant, sustained energy boost which enhances my concentration and performance. I feel GREAT when I take 9mm or 9mm+P!