Good advice!!! I had to try the Ttokkyo Tren so I did. I used one bottle when it ran out I changed to a "Homebrew" version both 75mg/ml. I noticed no difference from one to the other. Given the extreme price difference between the two I will be going with the "homebrew" for a while. If the price of the Ttokkyo comes down to a resonable level I will probably rethink this..