I had bought it from abroad before it came to Greece. It does an incredible job and maybe it is one of the few that does what it promises. Essentially, it blocks an enzyme called aromatase (look it up). Tests conducted by the company itself show incredible differences in the production of testosterone (for a supplement, they are truly amazing) in the individuals it was tested on, but this is only the company's test. Personally, I have seen significant differences in the gym and beyond. Also, recovery is much faster than before. It's worth trying, but not in excessive amounts. Follow the instructions to the letter because research on such supplements is not extensive, so avoid excessive doses. Needless to say, it is worth it, and now that it is available in Greece, I will buy it again and again.