Underground labs create Testosterone Propionate in numerous approaches. As is in human nature, some producers will look to maximize their profit on the expense of the consumer by employing less expensive oils, significantly less filtration due to lack of sophisticated equipment. To expedit filtration and dissolve reduced high quality raw supplies, some labs use Guaiacol, Benzyl Salicylate, Octyl Salicylate, or Ethyl Oleate – which are damaging to the human body. By employing these methods they are in a position to have a cheaper solution compared to larger high quality competition.
The Propionate ester is much faster acting (2-3 days) than Testosterone enanthate or Testosterone cypionate, and thus requires a more frequent injection schedule such as every day or every other day in order to keep blood levels as stable as possible. The benefit to this however, is that the steroid can be cleared from the body much more quickly after use is discontinued, thus making it a more preferable choice for tested athletes. Some bodybuilders also claim that Propionate tends to induce far fewer estrogen related side effects such as bloat than do the other esters of this powerful hormone.