It gives you energy and focus. Don’t feel sluggish. And it’s not habit-forming. 10 out of 10. Would recommend. I will buy again. Also, they are very transparent about what they put in it. Plus, the company's top-shelf grind responds to you. Very interactive. If you have not tried it, what are you waiting for? This is a very recommended product this MK 677 is absolutely working I feel like I'm young again. You will be my source now, guys. Thank you for your great customer service and fast delivery. It was indeed wonderful. I will give you five starts because of these. Thanks.