This product does what MK 677 claims. In my opinion, for men dealing with andropause issues which include lack of energy, moodiness, focus and poor sleep. I felt an improvement during the first week. I think it's important to use their other products such as Oxydrene, TestroVax and Thermodyne. I suggest you start with MK 677 and add other products 1 by one and see if they make you feel healthier. I have reordered for several months. And I am so happy. Their shipping is fast as well it alwyays arrived on time and the price is good. Great company and awesome stuff!!