Who would not say what and how many opinions would not express, everything is checked in practice and on himself. In my case, the product worked. Applied it, as indicated on the package and after about two weeks began to feel the effect. You can not even donate blood for hormonal indicators to understand this. In general, as a testosterone booster, this tribulus works. Of course, you need to take into account the different components and age and physical activity of a person. I have power 3-4 times a week, testosterone was at the bottom mark at the beginning of the reception, I never used chemistry - so maybe there was a real tangible effect. Yes, it is gradual and not rigid (there is no kind of split-off and aggression, etc.), but there is a clear expected effect on physical indicators. It is worth trying it out to see how it works in your case!