Well...you will know if its legit within a few days of running it. The day before i start cycle in earnest (and on a day off from the gym) i start running dbol. Saturate the blood before first workout, the following day (like monday for instance) i stat running my injectable compounds and hit the gym. I can notice a difference right away. U should be able to too. If by wednesday or thursday you arent gaining weight or noticing much larger pumps in the gym then i doubt you will.