I is completely ILLEGAL in the United States. It is covered by the Designer Anabolic Steroid Control Act (DASCA) of 2014 signed into law in Dec 2014 by Obama. That law (A) explicitly declared 24 compounds to be anabolic steroids and added them to the controlled substances list (the “List”) and (B) also made illegal compounds “similar” to testosterone or any other anabolic steroid on the List. And BTW – trestolone is more similar chemically to testosterone then many other listed anabolic steroids.
Also, the “research chemical” smoke screen the RC companies put up is a sham. They tell you that they are selling it for “research purposes only” and it's “not for human consumption.” Wink, wink. Here is the problem with that defense. It is what an attorney would call a sham defense. What I mean is that if someone sells to humans for the purpose of human consumption, merely stating “this is for research purposes only and not for human consumption”, does not necessary get that person off the hook. Why? Because hey know damn well that they are selling it for human consumption. Everyone with more than one neuron firing knows that the people buying it are not feeding it to lab rats.
These companies selling this stuff are knowingly doing something (selling to people who are consuming it) that is illegal. That's called Mens Rea (i.e., they're intent was to do the illegal thing). Stating to the contrary does not disestablish Mens Rea. In other words, imagine an abductor comes up to you on a dark street and holds a ****ed gun to your head and states “This is not a kidnapping. If you so desire, you can run away. However, I would appreciate it greatly if you would get into my car of your own free will. Once again, I would like to be clear. This is not a knapping.” Further imagine that despite the words the man just uttered, you get the feeling that this Mfer will pump a cap in your skull if you don't get in the car. And so you do. You have just been kidnapped regardless of the fact that your kidnapper told you it's not a kidnapping. Imagine that the kidnapper was arrested and he told the judge “but judge, I told him that him he could run away and in fact I stated that this was not a kidnapping.
If you don't agree with my analogy, perhaps I should add that there has been cases of the owners of RC companies successfully prosecuted and imprisoned for selling research chemicals even when they declared "not for human consumption".