Unfortunately there exists no test that can determine a bodybuilder's detailed drug use in the far past, and doping test results are very easy to manipulate . Therefore, if you really want to know whether a bodybuilder is true natural, or which drugs he has been using to build his physique, you will have to ask him. The standard answer to this question is, however, always "No, I have never used any drugs". However, if you get to know the guy better, develop some friendship, give him some complements on his physique, and especially if he thinks that you are a drug user yourself or interested in becoming one, he might well loosen up and start telling you at least part of his true story.
At least one studio made a conscious effort to keep its leading man squeaky clean. Before Cavill began his grueling five-month preproduction training for Steel , Warner Bros. requested a list of exactly what the training team might ask Cavill to use. Twight gladly complied, given that he believes radical body recomposition can be done naturally when it is guided by experienced trainers and driven by discipline and commitment. For Cavill, Twight recommended only Udo's Oil (a blend of essential fatty acids) and magnesium to aid sleep, the time when growth hormone occurs naturally.