Wow. Let me say that I’m bad with writing reviews but felt compelled to write one to help out Coach Greg & his incredible staff but to also recognize a quality supplement. I’ll also preface this with the fact that I have a VERY VERY high tolerance for caffeine. I did not notice anything until after 3 weeks & while it’s not been like OMG, I can definitely tell you that I have more energy, recover faster, and my workouts FEEL more productive. I have a general sense of just feeling better and stronger. I’m also going to try the Turk Platinum, which I just got. Cannot wait & will be posting a review on that as well. I would definitely say Coach Greg’s Turkesterone is worth the money & with a money back guarantee, you can’t lose!