Although i’d wager most of it ends up in humans, it is still sold as a Vetrinary Steroid. As a vetrinary steroid it was never approved for human use, which makes it impossible to get a prescription for it in the usa. add this to the fact that it is a schedule 2 controlled substance in the united states and it becomes quite clear that the only way to get this steroid in the usa is to buy it on the black market. that being said, it is still relatively easy to obtain the real stuff. This is because smuggling almost 2x as much testosterone in the same space is a rather enticing thing, making it commonly available.
Some bodybuilders and athletes use trenbolone esters for their muscle-building and otherwise performance-enhancing effects.  Such use is illegal in the United States and many other countries. The DEA classifies trenbolone and its esters as Schedule III controlled substances under the Controlled Substances Act .  Trenbolone is classified as a Schedule 4 drug in Canada  and a class C drug with no penalty for personal use or possession in the United Kingdom .  Use or possession of steroids without a prescription is a crime in Australia . 
Since almost the beginning of anabolic androgenic steroid use performance enhancers have continued to buy Testosterone-Propionate for their enhancing needs. Test-P is one of the oldest anabolic steroids ever made available and as it was popular in the beginning it is just as if not more popular today. This is important because over the years many anabolic steroids have come and gone but through it all Testosterone-Propionate has remained a stable constant as it is simply a pure testosterone hormone, rapidly acting and as such a perfect anabolic steroid. For cutting and bulking or to simply provide a little bump in athletic performance this is and will always be a perfect choice. Further, as it is so affordable those who buy Testosterone-Propionate cannot go wrong and that's the bottom line.